21, for a common factor you would need more than 1 number
ex: gcf between 21 and 14?
7
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A greatest common factor is used to compare two or more numbers to each other - a single number cannot have a Greatest Common Factor.
The Greatest Common Divisor (GCD) for 21 39 is 3.
The Greatest Common Divisor is 21
The Greatest Common Divisor of 105, 189 is 21.
3
The Greatest Common Divisor is 10