What is the Greatest Common Factor of 21006 and 21021?

Greatest common factor (GCF) of 21006 and 21021 is 3.

GCF(21006,21021) = 3

We will now calculate the prime factors of 21006 and 21021, than find the greatest common factor (greatest common divisor (gcd)) of the numbers by matching the biggest common factor of 21006 and 21021.

How to find the GCF of 21006 and 21021?

We will first find the prime factorization of 21006 and 21021. After we will calculate the factors of 21006 and 21021 and find the biggest common factor number .

Step-1: Prime Factorization of 21006

Prime factors of 21006 are 2, 3, 389. Prime factorization of 21006 in exponential form is:

21006 = 2¹ × 3³ × 389¹

Step-2: Prime Factorization of 21021

Prime factors of 21021 are 3, 7, 11, 13. Prime factorization of 21021 in exponential form is:

21021 = 3¹ × 7² × 11¹ × 13¹

Step-3: Factors of 21006

List of positive integer factors of 21006 that divides 21006 without a remainder.

1, 2, 3, 6, 9, 18, 27, 54, 389, 778, 1167, 2334, 3501, 7002, 10503

Step-4: Factors of 21021

List of positive integer factors of 21021 that divides 21006 without a remainder.

1, 3, 7, 11, 13, 21, 33, 39, 49, 77, 91, 143, 147, 231, 273, 429, 539, 637, 1001, 1617, 1911, 3003, 7007

Final Step: Biggest Common Factor Number

We found the factors and prime factorization of 21006 and 21021. The biggest common factor number is the GCF number.
So the greatest common factor 21006 and 21021 is 3.

Also check out the Least Common Multiple of 21006 and 21021