Q: What is the sum of all factors of the number 21,109 excluding 21,109?
A: 3,371
The factors of the number 21,109 are: 1, 11, 19, 101, 209, 1111, 1919, 21109.
If you add them up, you will get the total of 21,112. Now subtract 21,109 to get 3,371