Q: What is the sum of all factors of the number 21,721 excluding 21,721?
A: 4,199
The factors of the number 21,721 are: 1, 7, 29, 107, 203, 749, 3103, 21721.
If you add them up, you will get the total of 21,725. Now subtract 21,721 to get 4,199