Q: What is the sum of all factors of the number 21,489 excluding 21,489?
A: 12,111
The factors of the number 21,489 are: 1, 3, 13, 19, 29, 39, 57, 87, 247, 377, 551, 741, 1131, 1653, 7163, 21489.
If you add them up, you will get the total of 21,501. Now subtract 21,489 to get 12,111