Q: What is the sum of all factors of the number 4,221 excluding 4,221?
A: 2,851
The factors of the number 4,221 are: 1, 3, 7, 9, 21, 63, 67, 201, 469, 603, 1407, 4221.
If you add them up, you will get the total of 4,223. Now subtract 4,221 to get 2,851