What is the Greatest Common Factor of 21220 and 21225?

Greatest common factor (GCF) of 21220 and 21225 is 5.

GCF(21220,21225) = 5

We will now calculate the prime factors of 21220 and 21225, than find the greatest common factor (greatest common divisor (gcd)) of the numbers by matching the biggest common factor of 21220 and 21225.

How to find the GCF of 21220 and 21225?

We will first find the prime factorization of 21220 and 21225. After we will calculate the factors of 21220 and 21225 and find the biggest common factor number .

Step-1: Prime Factorization of 21220

Prime factors of 21220 are 2, 5, 1061. Prime factorization of 21220 in exponential form is:

21220 = 2² × 5¹ × 1061¹

Step-2: Prime Factorization of 21225

Prime factors of 21225 are 3, 5, 283. Prime factorization of 21225 in exponential form is:

21225 = 3¹ × 5² × 283¹

Step-3: Factors of 21220

List of positive integer factors of 21220 that divides 21220 without a remainder.

1, 2, 4, 5, 10, 20, 1061, 2122, 4244, 5305, 10610

Step-4: Factors of 21225

List of positive integer factors of 21225 that divides 21220 without a remainder.

1, 3, 5, 15, 25, 75, 283, 849, 1415, 4245, 7075

Final Step: Biggest Common Factor Number

We found the factors and prime factorization of 21220 and 21225. The biggest common factor number is the GCF number.
So the greatest common factor 21220 and 21225 is 5.

Also check out the Least Common Multiple of 21220 and 21225