Q: What is the sum of all factors of the number 13,221 excluding 13,221?
A: 7,527
The factors of the number 13,221 are: 1, 3, 9, 13, 39, 113, 117, 339, 1017, 1469, 4407, 13221.
If you add them up, you will get the total of 13,228. Now subtract 13,221 to get 7,527