What is the Greatest Common Factor of 21615 and 21628?

Greatest common factor (GCF) of 21615 and 21628 is 1.

GCF(21615,21628) = 1

We will now calculate the prime factors of 21615 and 21628, than find the greatest common factor (greatest common divisor (gcd)) of the numbers by matching the biggest common factor of 21615 and 21628.

How to find the GCF of 21615 and 21628?

We will first find the prime factorization of 21615 and 21628. After we will calculate the factors of 21615 and 21628 and find the biggest common factor number .

Step-1: Prime Factorization of 21615

Prime factors of 21615 are 3, 5, 11, 131. Prime factorization of 21615 in exponential form is:

21615 = 3¹ × 5¹ × 11¹ × 131¹

Step-2: Prime Factorization of 21628

Prime factors of 21628 are 2, 5407. Prime factorization of 21628 in exponential form is:

21628 = 2² × 5407¹

Step-3: Factors of 21615

List of positive integer factors of 21615 that divides 21615 without a remainder.

1, 3, 5, 11, 15, 33, 55, 131, 165, 393, 655, 1441, 1965, 4323, 7205

Step-4: Factors of 21628

List of positive integer factors of 21628 that divides 21615 without a remainder.

1, 2, 4, 5407, 10814

Final Step: Biggest Common Factor Number

We found the factors and prime factorization of 21615 and 21628. The biggest common factor number is the GCF number.
So the greatest common factor 21615 and 21628 is 1.

Also check out the Least Common Multiple of 21615 and 21628