The factors of the number 151,221,168 are: 1, 2, 3, 4, 6, 7, 8, 9, 12, 14, 16, 18, 21, 24, 27, 28, 36, 42, 48, 54, 56, 63, 72, 79, 81, 84, 108, 112, 126, 144, 158, 162, 168, 189, 211, 216, 237, 252, 316, 324, 336, 378, 422, 432, 474, 504, 553, 567, 632, 633, 648, 711, 756, 844, 948, 1008, 1106, 1134, 1264, 1266, 1296, 1422, 1477, 1512, 1659, 1688, 1896, 1899, 2133, 2212, 2268, 2532, 2844, 2954, 3024, 3318, 3376, 3792, 3798, 4266, 4424, 4431, 4536, 4977, 5064, 5688, 5697, 5908, 6399, 6636, 7596, 8532, 8848, 8862, 9072, 9954, 10128, 11376, 11394, 11816, 12798, 13272, 13293, 14931, 15192, 16669, 17064, 17091, 17724, 19908, 22788, 23632, 25596, 26544, 26586, 29862, 30384, 33338, 34128, 34182, 35448, 39816, 39879, 44793, 45576, 50007, 51192, 53172, 59724, 66676, 68364, 70896, 79632, 79758, 89586, 91152, 100014, 102384, 106344, 116683, 119448, 119637, 133352, 136728, 150021, 159516, 179172, 200028, 212688, 233366, 238896, 239274, 266704, 273456, 300042, 319032, 350049, 358344, 400056, 450063, 466732, 478548, 600084, 638064, 700098, 716688, 800112, 900126, 933464, 957096, 1050147, 1200168, 1350189, 1400196, 1800252, 1866928, 1914192, 2100294, 2400336, 2700378, 2800392, 3150441, 3600504, 4200588, 5400756, 5600784, 6300882, 7201008, 8401176, 9451323, 10801512, 12601764, 16802352, 18902646, 21603024, 25203528, 37805292, 50407056, 75610584, 151221168.
If you add them up, you will get the total of 508,935,680.