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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.

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