Q: What is the sum of all factors of the number 213,121,311 excluding 213,121,311?

A: 104,277,729

Why is 104,277,729 the sum of all factors of 213,121,311, excluding 213,121,311?

The factors of the number 213,121,311 are: 1, 3, 13, 31, 39, 93, 403, 409, 431, 1209, 1227, 1293, 5317, 5603, 12679, 13361, 15951, 16809, 38037, 40083, 164827, 173693, 176279, 494481, 521079, 528837, 2291627, 5464649, 6874881, 16393947, 71040437, 213121311.

If you add them up, you will get the total of 213,121,415. Now subtract 213,121,311 to get 104,277,729