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If 1 is considered a factor, the only common factor of 21 & 19 is 1, because 19 is a Prime number. I'm not sure whether 1 is considered a factor since it does not reduce the original number and it's not a prime number.
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∙ 11y ago
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Greatest common factor of 19 and 21?
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What is the greatest common factor of 19 and 21?
A factor is a divisor - a number that will evenly divide into another number. The greatest common factor of two or more numbers is the largest factor that both numbers have in common. One way to determine the common factors and greatest common factor is to find all the factors of the numbers and compare them. The factors of 19 are 1 and 19. The factors of 21 are 1, 3, 7, and 21. The only common factor is 1. Therefore, the greatest common factor is 1, which means the numbers are relatively prime.
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