What is the Greatest Common Factor of 21210 and 21218?

Greatest common factor (GCF) of 21210 and 21218 is 2.

GCF(21210,21218) = 2

We will now calculate the prime factors of 21210 and 21218, than find the greatest common factor (greatest common divisor (gcd)) of the numbers by matching the biggest common factor of 21210 and 21218.

How to find the GCF of 21210 and 21218?

We will first find the prime factorization of 21210 and 21218. After we will calculate the factors of 21210 and 21218 and find the biggest common factor number .

Step-1: Prime Factorization of 21210

Prime factors of 21210 are 2, 3, 5, 7, 101. Prime factorization of 21210 in exponential form is:

21210 = 2¹ × 3¹ × 5¹ × 7¹ × 101¹

Step-2: Prime Factorization of 21218

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

21218 = 2¹ × 103²

Step-3: Factors of 21210

List of positive integer factors of 21210 that divides 21210 without a remainder.

1, 2, 3, 5, 6, 7, 10, 14, 15, 21, 30, 35, 42, 70, 101, 105, 202, 210, 303, 505, 606, 707, 1010, 1414, 1515, 2121, 3030, 3535, 4242, 7070, 10605

Step-4: Factors of 21218

List of positive integer factors of 21218 that divides 21210 without a remainder.

1, 2, 103, 206, 10609

Final Step: Biggest Common Factor Number

We found the factors and prime factorization of 21210 and 21218. The biggest common factor number is the GCF number.
So the greatest common factor 21210 and 21218 is 2.

Also check out the Least Common Multiple of 21210 and 21218