Q: What are the prime factors of the number 21,001,024?

 A: 2, 11, 23, 1297

Why are those the prime factors of the number 21,001,024?

Prime factors are the prime numbers that can be multipled together to equal the original number. You find the factors by dividing by prime numbers. It is best shown by creating a Factor Tree.

Factor Tree for the number 21,001,024

21,001,024
Factor Arrows
210,500,512
Factor Arrows
25,250,256
Factor Arrows
22,625,128
Factor Arrows
21,312,564
Factor Arrows
2656,282
Factor Arrows
2328,141
Factor Arrows
1129,831
Factor Arrows
231,297

The numbers in bold above are the prime factors. If there are multiples, you only count them one time. This leads us to our prime factors of:

2, 11, 23, 1297

We can check our work by multiplying all of the prime factors together: 2 x 2 x 2 x 2 x 2 x 2 x 11 x 23 x 1,297 = 21,001,024

This can also be written as 26 x 111 x 231 x 1,2971 = 21,001,024

If you would like to know more, or need additional explanation, please review our prime factorization explanation.


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