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The greatest factor of 21 and 16 is 21, which is a factor of 21 but not of 16.

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The greatest common factor of 16 and 21 is 1

The GCF is 1.

Q: What is the greatest common factor of 16 and 21?

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The factors of 16 are 1, 2, 4, 8, and 16. The factors of 21 are 1, 3, 7, and 21. The only common factor is 1; they are relatively prime. The least (or lowest) common factor is 1. The greatest (or highest) common factor is 1.

The greatest common factor of 21 and 75 is 3.

The greatest common factor of 21 and 322 is 7.

The greatest common factor of 105 and 147 is 21

The common factors of 21 and 42 are 3, 7 and 21. The greatest common factor (GCF) is 21.

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The Greatest Common Factor (GCF) is: 1

The GCF is 1.

The GCF is 1.

The GCF is 1.

The GCF is 1.

The greatest common factor of 21 and 77 is 7.

The factors of 16 are 1, 2, 4, 8, and 16. The factors of 21 are 1, 3, 7, and 21. The only common factor is 1; they are relatively prime. The least (or lowest) common factor is 1. The greatest (or highest) common factor is 1.

The greatest common factor of 21 and 175 is 7.

The greatest common factor of 21 and 75 is 3.

The greatest common factor of 21 and 162 is 3.

The greatest common factor of 21 and 322 is 7.

The greatest common factor of 21 and 56 is 7.