Q: What is the sum of all factors of the number 21,391 excluding 21,391?

 A: 1

Why is 1 the sum of all factors of 21,391, excluding 21,391?

The factors of the number 21,391 are: 1, 21391.

If you add them up, you will get the total of 21,392. Now subtract 21,391 to get 1


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