Q: What is the sum of all factors of the number 4,131 excluding 4,131?
A: 2,421
The factors of the number 4,131 are: 1, 3, 9, 17, 27, 51, 81, 153, 243, 459, 1377, 4131.
If you add them up, you will get the total of 4,133. Now subtract 4,131 to get 2,421