Q: What are the prime factors of the number 21,991,938?

 A: 2, 3, 233, 15731

Why are those the prime factors of the number 21,991,938?

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 21,991,938

21,991,938
Factor Arrows
210,995,969
Factor Arrows
33,665,323
Factor Arrows
23315,731

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, 3, 233, 15731

We can check our work by multiplying all of the prime factors together: 2 x 3 x 233 x 15,731 = 21,991,938

This can also be written as 21 x 31 x 2331 x 15,7311 = 21,991,938

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


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