What is the Greatest Common Factor of 21158 and 21165?

Greatest common factor (GCF) of 21158 and 21165 is 1.

GCF(21158,21165) = 1

We will now calculate the prime factors of 21158 and 21165, than find the greatest common factor (greatest common divisor (gcd)) of the numbers by matching the biggest common factor of 21158 and 21165.

How to find the GCF of 21158 and 21165?

We will first find the prime factorization of 21158 and 21165. After we will calculate the factors of 21158 and 21165 and find the biggest common factor number .

Step-1: Prime Factorization of 21158

Prime factors of 21158 are 2, 71, 149. Prime factorization of 21158 in exponential form is:

21158 = 2¹ × 71¹ × 149¹

Step-2: Prime Factorization of 21165

Prime factors of 21165 are 3, 5, 17, 83. Prime factorization of 21165 in exponential form is:

21165 = 3¹ × 5¹ × 17¹ × 83¹

Step-3: Factors of 21158

List of positive integer factors of 21158 that divides 21158 without a remainder.

1, 2, 71, 142, 149, 298, 10579

Step-4: Factors of 21165

List of positive integer factors of 21165 that divides 21158 without a remainder.

1, 3, 5, 15, 17, 51, 83, 85, 249, 255, 415, 1245, 1411, 4233, 7055

Final Step: Biggest Common Factor Number

We found the factors and prime factorization of 21158 and 21165. The biggest common factor number is the GCF number.
So the greatest common factor 21158 and 21165 is 1.

Also check out the Least Common Multiple of 21158 and 21165