Q: What are the prime factors of the number 211,904?

 A: 2, 7, 11, 43

Why are those the prime factors of the number 211,904?

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 211,904

211,904
Factor Arrows
2105,952
Factor Arrows
252,976
Factor Arrows
226,488
Factor Arrows
213,244
Factor Arrows
26,622
Factor Arrows
23,311
Factor Arrows
7473
Factor Arrows
1143

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, 7, 11, 43

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 7 x 11 x 43 = 211,904

This can also be written as 26 x 71 x 111 x 431 = 211,904

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


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