What is the Greatest Common Factor of 21545 and 21557?

Greatest common factor (GCF) of 21545 and 21557 is 1.

GCF(21545,21557) = 1

We will now calculate the prime factors of 21545 and 21557, than find the greatest common factor (greatest common divisor (gcd)) of the numbers by matching the biggest common factor of 21545 and 21557.

How to find the GCF of 21545 and 21557?

We will first find the prime factorization of 21545 and 21557. After we will calculate the factors of 21545 and 21557 and find the biggest common factor number .

Step-1: Prime Factorization of 21545

Prime factors of 21545 are 5, 31, 139. Prime factorization of 21545 in exponential form is:

21545 = 5¹ × 31¹ × 139¹

Step-2: Prime Factorization of 21557

Prime factors of 21557 are 21557. Prime factorization of 21557 in exponential form is:

21557 = 21557¹

Step-3: Factors of 21545

List of positive integer factors of 21545 that divides 21545 without a remainder.

1, 5, 31, 139, 155, 695, 4309

Step-4: Factors of 21557

List of positive integer factors of 21557 that divides 21545 without a remainder.

Final Step: Biggest Common Factor Number

We found the factors and prime factorization of 21545 and 21557. The biggest common factor number is the GCF number.
So the greatest common factor 21545 and 21557 is 1.

Also check out the Least Common Multiple of 21545 and 21557