What is the Greatest Common Factor of 21621 and 21640?

Greatest common factor (GCF) of 21621 and 21640 is 1.

GCF(21621,21640) = 1

We will now calculate the prime factors of 21621 and 21640, than find the greatest common factor (greatest common divisor (gcd)) of the numbers by matching the biggest common factor of 21621 and 21640.

How to find the GCF of 21621 and 21640?

We will first find the prime factorization of 21621 and 21640. After we will calculate the factors of 21621 and 21640 and find the biggest common factor number .

Step-1: Prime Factorization of 21621

Prime factors of 21621 are 3, 7207. Prime factorization of 21621 in exponential form is:

21621 = 3¹ × 7207¹

Step-2: Prime Factorization of 21640

Prime factors of 21640 are 2, 5, 541. Prime factorization of 21640 in exponential form is:

21640 = 2³ × 5¹ × 541¹

Step-3: Factors of 21621

List of positive integer factors of 21621 that divides 21621 without a remainder.

1, 3, 7207

Step-4: Factors of 21640

List of positive integer factors of 21640 that divides 21621 without a remainder.

1, 2, 4, 5, 8, 10, 20, 40, 541, 1082, 2164, 2705, 4328, 5410, 10820

Final Step: Biggest Common Factor Number

We found the factors and prime factorization of 21621 and 21640. The biggest common factor number is the GCF number.
So the greatest common factor 21621 and 21640 is 1.

Also check out the Least Common Multiple of 21621 and 21640