What is the Greatest Common Factor of 21220 and 21235?

Greatest common factor (GCF) of 21220 and 21235 is 5.

GCF(21220,21235) = 5

We will now calculate the prime factors of 21220 and 21235, than find the greatest common factor (greatest common divisor (gcd)) of the numbers by matching the biggest common factor of 21220 and 21235.

How to find the GCF of 21220 and 21235?

We will first find the prime factorization of 21220 and 21235. After we will calculate the factors of 21220 and 21235 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 21235

Prime factors of 21235 are 5, 31, 137. Prime factorization of 21235 in exponential form is:

21235 = 5¹ × 31¹ × 137¹

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 21235

List of positive integer factors of 21235 that divides 21220 without a remainder.

1, 5, 31, 137, 155, 685, 4247

Final Step: Biggest Common Factor Number

We found the factors and prime factorization of 21220 and 21235. The biggest common factor number is the GCF number.
So the greatest common factor 21220 and 21235 is 5.

Also check out the Least Common Multiple of 21220 and 21235