The factors of 121 are 1•121 and 11•11 :)
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The greatest common factor of 21 and 121 is 1. (21 and 121 are relatively prime.)
The only common factor of 24 and 121 is 1.
The factors of 121 are 1, 11, 121 For them to be common, they need to be compared to another set of factors.
The greatest common factor (GCF) is often also called the greatest common divisor (GCD) or highest common factor (HCF). Keep in mind that these different terms all refer to the same thing: the largest integer which evenly divides two or more numbers.The greatest common factor of 20 and 121 is 1
The GREATEST common factor is 11.