What is the Greatest Common Factor of 421 and 428?

Greatest common factor (GCF) of 421 and 428 is 1.

GCF(421,428) = 1

We will now calculate the prime factors of 421 and 428, than find the greatest common factor (greatest common divisor (gcd)) of the numbers by matching the biggest common factor of 421 and 428.

How to find the GCF of 421 and 428?

We will first find the prime factorization of 421 and 428. After we will calculate the factors of 421 and 428 and find the biggest common factor number .

Step-1: Prime Factorization of 421

Prime factors of 421 are 421. Prime factorization of 421 in exponential form is:

421 = 421¹

Step-2: Prime Factorization of 428

Prime factors of 428 are 2, 107. Prime factorization of 428 in exponential form is:

428 = 2² × 107¹

Step-3: Factors of 421

List of positive integer factors of 421 that divides 421 without a remainder.

Step-4: Factors of 428

List of positive integer factors of 428 that divides 421 without a remainder.

1, 2, 4, 107, 214

Final Step: Biggest Common Factor Number

We found the factors and prime factorization of 421 and 428. The biggest common factor number is the GCF number.
So the greatest common factor 421 and 428 is 1.

Also check out the Least Common Multiple of 421 and 428