What is the Greatest Common Factor of 21218 and 21222?

Greatest common factor (GCF) of 21218 and 21222 is 2.

GCF(21218,21222) = 2

We will now calculate the prime factors of 21218 and 21222, than find the greatest common factor (greatest common divisor (gcd)) of the numbers by matching the biggest common factor of 21218 and 21222.

How to find the GCF of 21218 and 21222?

We will first find the prime factorization of 21218 and 21222. After we will calculate the factors of 21218 and 21222 and find the biggest common factor number .

Step-1: Prime Factorization of 21218

Prime factors of 21218 are 2, 103. Prime factorization of 21218 in exponential form is:

21218 = 2¹ × 103²

Step-2: Prime Factorization of 21222

Prime factors of 21222 are 2, 3, 131. Prime factorization of 21222 in exponential form is:

21222 = 2¹ × 3⁴ × 131¹

Step-3: Factors of 21218

List of positive integer factors of 21218 that divides 21218 without a remainder.

1, 2, 103, 206, 10609

Step-4: Factors of 21222

List of positive integer factors of 21222 that divides 21218 without a remainder.

1, 2, 3, 6, 9, 18, 27, 54, 81, 131, 162, 262, 393, 786, 1179, 2358, 3537, 7074, 10611

Final Step: Biggest Common Factor Number

We found the factors and prime factorization of 21218 and 21222. The biggest common factor number is the GCF number.
So the greatest common factor 21218 and 21222 is 2.

Also check out the Least Common Multiple of 21218 and 21222