Q: What is the sum of all factors of the number 28,221 excluding 28,221?

 A: 11,139

Why is 11,139 the sum of all factors of 28,221, excluding 28,221?

The factors of the number 28,221 are: 1, 3, 23, 69, 409, 1227, 9407, 28221.

If you add them up, you will get the total of 28,232. Now subtract 28,221 to get 11,139


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