What is the Greatest Common Factor of 21423 and 21429?

Greatest common factor (GCF) of 21423 and 21429 is 3.

GCF(21423,21429) = 3

We will now calculate the prime factors of 21423 and 21429, than find the greatest common factor (greatest common divisor (gcd)) of the numbers by matching the biggest common factor of 21423 and 21429.

How to find the GCF of 21423 and 21429?

We will first find the prime factorization of 21423 and 21429. After we will calculate the factors of 21423 and 21429 and find the biggest common factor number .

Step-1: Prime Factorization of 21423

Prime factors of 21423 are 3, 37, 193. Prime factorization of 21423 in exponential form is:

21423 = 3¹ × 37¹ × 193¹

Step-2: Prime Factorization of 21429

Prime factors of 21429 are 3, 2381. Prime factorization of 21429 in exponential form is:

21429 = 3² × 2381¹

Step-3: Factors of 21423

List of positive integer factors of 21423 that divides 21423 without a remainder.

1, 3, 37, 111, 193, 579, 7141

Step-4: Factors of 21429

List of positive integer factors of 21429 that divides 21423 without a remainder.

1, 3, 9, 2381, 7143

Final Step: Biggest Common Factor Number

We found the factors and prime factorization of 21423 and 21429. The biggest common factor number is the GCF number.
So the greatest common factor 21423 and 21429 is 3.

Also check out the Least Common Multiple of 21423 and 21429