Q: What is the sum of all factors of the number 21,216 including 21,216?

A: 63,504

Why is 63,504 the sum of all factors of 21,216, including 21,216?

The factors of the number 21,216 are: 1, 2, 3, 4, 6, 8, 12, 13, 16, 17, 24, 26, 32, 34, 39, 48, 51, 52, 68, 78, 96, 102, 104, 136, 156, 204, 208, 221, 272, 312, 408, 416, 442, 544, 624, 663, 816, 884, 1248, 1326, 1632, 1768, 2652, 3536, 5304, 7072, 10608, 21216.

If you add them up, you will get the total of 63,504.