Q: What is the sum of all factors of the number 21,123,521 excluding 21,123,521?

 A: 398,611

Why is 398,611 the sum of all factors of 21,123,521, excluding 21,123,521?

The factors of the number 21,123,521 are: 1, 53, 398557, 21123521.

If you add them up, you will get the total of 21,123,919. Now subtract 21,123,521 to get 398,611


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