Q: What is the sum of all factors of the number 21,138 excluding 21,138?
A: 24,558
The factors of the number 21,138 are: 1, 2, 3, 6, 13, 26, 39, 78, 271, 542, 813, 1626, 3523, 7046, 10569, 21138.
If you add them up, you will get the total of 21,162. Now subtract 21,138 to get 24,558