<?php
$input = 423219;
$rev = 0;

while ($input > 0) {
    $rev = ($rev * 10 + ($input % 10) );
    $input = $input / 10;
    echo $input;
}

echo $rev;

42321.94232.19423.21942.32194.232190.4232190.04232190.004232190.0004232194.23219E-54.23219E-64.23219E-74.23219E-84.23219E-94.23219E-104.23219E-114.23219E-124.23219E-134.23219E-144.23219E-154.23219E-164.23219E-174.23219E-184.23219E-194.23219E-204.23219E-214.23219E-224.23219E-234.23219E-244.23219E-254.23219E-264.23219E-274.23219E-284.23219E-294.23219E-304.23219E-314.23219E-324.23219E-334.23219E-344.23219E-354.23219E-364.23219E-374.23219E-384.23219E-394.23219E-404.23219E-414.23219E-424.23219E-434.23219E-444.23219E-454.23219E-464.23219E-474.23219E-484.23219E-494.23219E-504.23219E-514.23219E-524.23219E-534.23219E-544.23219E-554.23219E-564.23219E-574.23219E-584.23219E-594.23219E-604.23219E-614.23219E-624.23219E-634.23219E-644.23219E-654.23219E-664.23219E-674.23219E-684.23219E-694.23219E-704.23219E-714.23219E-724.23219E-734.23219E-744.23219E-754.23219E-764.23219E-774.23219E-784.23219E-794.23219E-804.23219E-814.23219E-824.23219E-834.23219E-844.23219E-854.23219E-864.23219E-874.23219E-884.23219E-894.23219E-904.23219E-914.23219E-924.23219E-934.23219E-944.23219E-954.23219E-964.23219E-974.23219E-984.23219E-994.23219E-1004.23219E-1014.23219E-1024.23219E-1034.23219E-1044.23219E-1054.23219E-1064.23219E-1074.23219E-1084.23219E-1094.23219E-1104.23219E-1114.23219E-1124.23219E-1134.23219E-1144.23219E-1154.23219E-1164.23219E-1174.23219E-1184.23219E-1194.23219E-1204.23219E-1214.23219E-1224.23219E-1234.23219E-1244.23219E-1254.23219E-1264.23219E-1274.23219E-1284.23219E-1294.23219E-1304.23219E-1314.23219E-1324.23219E-1334.23219E-1344.23219E-1354.23219E-1364.23219E-1374.23219E-1384.23219E-1394.23219E-1404.23219E-1414.23219E-1424.23219E-1434.23219E-1444.23219E-1454.23219E-1464.23219E-1474.23219E-1484.23219E-1494.23219E-1504.23219E-1514.23219E-1524.23219E-1534.23219E-1544.23219E-1554.23219E-1564.23219E-1574.23219E-1584.23219E-1594.23219E-1604.23219E-1614.23219E-1624.23219E-1634.23219E-1644.23219E-1654.23219E-1664.23219E-1674.23219E-1684.23219E-1694.23219E-1704.23219E-1714.23219E-1724.23219E-1734.23219E-1744.23219E-1754.23219E-1764.23219E-1774.23219E-1784.23219E-1794.23219E-1804.23219E-1814.23219E-1824.23219E-1834.23219E-1844.23219E-1854.23219E-1864.23219E-1874.23219E-1884.23219E-1894.23219E-1904.23219E-1914.23219E-1924.23219E-1934.23219E-1944.23219E-1954.23219E-1964.23219E-1974.23219E-1984.23219E-1994.23219E-2004.23219E-2014.23219E-2024.23219E-2034.23219E-2044.23219E-2054.23219E-2064.23219E-2074.23219E-2084.23219E-2094.23219E-2104.23219E-2114.23219E-2124.23219E-2134.23219E-2144.23219E-2154.23219E-2164.23219E-2174.23219E-2184.23219E-2194.23219E-2204.23219E-2214.23219E-2224.23219E-2234.23219E-2244.23219E-2254.23219E-2264.23219E-2274.23219E-2284.23219E-2294.23219E-2304.23219E-2314.23219E-2324.23219E-2334.23219E-2344.23219E-2354.23219E-2364.23219E-2374.23219E-2384.23219E-2394.23219E-2404.23219E-2414.23219E-2424.23219E-2434.23219E-2444.23219E-2454.23219E-2464.23219E-2474.23219E-2484.23219E-2494.23219E-2504.23219E-2514.23219E-2524.23219E-2534.23219E-2544.23219E-2554.23219E-2564.23219E-2574.23219E-2584.23219E-2594.23219E-2604.23219E-2614.23219E-2624.23219E-2634.23219E-2644.23219E-2654.23219E-2664.23219E-2674.23219E-2684.23219E-2694.23219E-2704.23219E-2714.23219E-2724.23219E-2734.23219E-2744.23219E-2754.23219E-2764.23219E-2774.23219E-2784.23219E-2794.23219E-2804.23219E-2814.23219E-2824.23219E-2834.23219E-2844.23219E-2854.23219E-2864.23219E-2874.23219E-2884.23219E-2894.23219E-2904.23219E-2914.23219E-2924.23219E-2934.23219E-2944.23219E-2954.23219E-2964.23219E-2974.23219E-2984.23219E-2994.23219E-3004.23219E-3014.23219E-3024.23219E-3034.23219E-3044.23219E-3054.23219E-3064.23219E-3074.23219E-3084.23219E-3094.23219E-3104.2321900000002E-3114.2321900000016E-3124.2321899999769E-3134.2321899998781E-3144.2321899979019E-3154.2321899880206E-3164.2321900374271E-3174.2321910255584E-3184.2321663222761E-3194.2321663222761E-3204.2341425848595E-3214.2489645542347E-3224.4465908125712E-3234.9406564584125E-3240INF