What is the Greatest Common Factor of 21421 and 21425?

Greatest common factor (GCF) of 21421 and 21425 is 1.

GCF(21421,21425) = 1

We will now calculate the prime factors of 21421 and 21425, than find the greatest common factor (greatest common divisor (gcd)) of the numbers by matching the biggest common factor of 21421 and 21425.

How to find the GCF of 21421 and 21425?

We will first find the prime factorization of 21421 and 21425. After we will calculate the factors of 21421 and 21425 and find the biggest common factor number .

Step-1: Prime Factorization of 21421

Prime factors of 21421 are 31, 691. Prime factorization of 21421 in exponential form is:

21421 = 31¹ × 691¹

Step-2: Prime Factorization of 21425

Prime factors of 21425 are 5, 857. Prime factorization of 21425 in exponential form is:

21425 = 5² × 857¹

Step-3: Factors of 21421

List of positive integer factors of 21421 that divides 21421 without a remainder.

1, 31, 691

Step-4: Factors of 21425

List of positive integer factors of 21425 that divides 21421 without a remainder.

1, 5, 25, 857, 4285

Final Step: Biggest Common Factor Number

We found the factors and prime factorization of 21421 and 21425. The biggest common factor number is the GCF number.
So the greatest common factor 21421 and 21425 is 1.

Also check out the Least Common Multiple of 21421 and 21425