What is the Greatest Common Factor of 21465 and 21478?

Greatest common factor (GCF) of 21465 and 21478 is 1.

GCF(21465,21478) = 1

We will now calculate the prime factors of 21465 and 21478, than find the greatest common factor (greatest common divisor (gcd)) of the numbers by matching the biggest common factor of 21465 and 21478.

How to find the GCF of 21465 and 21478?

We will first find the prime factorization of 21465 and 21478. After we will calculate the factors of 21465 and 21478 and find the biggest common factor number .

Step-1: Prime Factorization of 21465

Prime factors of 21465 are 3, 5, 53. Prime factorization of 21465 in exponential form is:

21465 = 3⁴ × 5¹ × 53¹

Step-2: Prime Factorization of 21478

Prime factors of 21478 are 2, 10739. Prime factorization of 21478 in exponential form is:

21478 = 2¹ × 10739¹

Step-3: Factors of 21465

List of positive integer factors of 21465 that divides 21465 without a remainder.

1, 3, 5, 9, 15, 27, 45, 53, 81, 135, 159, 265, 405, 477, 795, 1431, 2385, 4293, 7155

Step-4: Factors of 21478

List of positive integer factors of 21478 that divides 21465 without a remainder.

1, 2, 10739

Final Step: Biggest Common Factor Number

We found the factors and prime factorization of 21465 and 21478. The biggest common factor number is the GCF number.
So the greatest common factor 21465 and 21478 is 1.

Also check out the Least Common Multiple of 21465 and 21478