The factors of the number 121,553,520 are: 1, 2, 3, 4, 5, 6, 8, 10, 11, 12, 15, 16, 20, 22, 24, 30, 33, 40, 41, 44, 48, 55, 60, 66, 80, 82, 88, 110, 120, 123, 132, 164, 165, 176, 205, 220, 240, 246, 264, 328, 330, 410, 440, 451, 492, 528, 615, 656, 660, 820, 880, 902, 984, 1123, 1230, 1320, 1353, 1640, 1804, 1968, 2246, 2255, 2460, 2640, 2706, 3280, 3369, 3608, 4492, 4510, 4920, 5412, 5615, 6738, 6765, 7216, 8984, 9020, 9840, 10824, 11230, 12353, 13476, 13530, 16845, 17968, 18040, 21648, 22460, 24706, 26952, 27060, 33690, 36080, 37059, 44920, 46043, 49412, 53904, 54120, 61765, 67380, 74118, 89840, 92086, 98824, 108240, 123530, 134760, 138129, 148236, 184172, 185295, 197648, 230215, 247060, 269520, 276258, 296472, 368344, 370590, 460430, 494120, 506473, 552516, 592944, 690645, 736688, 741180, 920860, 988240, 1012946, 1105032, 1381290, 1482360, 1519419, 1841720, 2025892, 2210064, 2532365, 2762580, 2964720, 3038838, 3683440, 4051784, 5064730, 5525160, 6077676, 7597095, 8103568, 10129460, 11050320, 12155352, 15194190, 20258920, 24310704, 30388380, 40517840, 60776760, 121553520.
If you add them up, you will get the total of 421,473,024.