What is the Greatest Common Factor of 7215 and 7221?

Greatest common factor (GCF) of 7215 and 7221 is 3.

GCF(7215,7221) = 3

We will now calculate the prime factors of 7215 and 7221, than find the greatest common factor (greatest common divisor (gcd)) of the numbers by matching the biggest common factor of 7215 and 7221.

How to find the GCF of 7215 and 7221?

We will first find the prime factorization of 7215 and 7221. After we will calculate the factors of 7215 and 7221 and find the biggest common factor number .

Step-1: Prime Factorization of 7215

Prime factors of 7215 are 3, 5, 13, 37. Prime factorization of 7215 in exponential form is:

7215 = 3¹ × 5¹ × 13¹ × 37¹

Step-2: Prime Factorization of 7221

Prime factors of 7221 are 3, 29, 83. Prime factorization of 7221 in exponential form is:

7221 = 3¹ × 29¹ × 83¹

Step-3: Factors of 7215

List of positive integer factors of 7215 that divides 7215 without a remainder.

1, 3, 5, 13, 15, 37, 39, 65, 111, 185, 195, 481, 555, 1443, 2405

Step-4: Factors of 7221

List of positive integer factors of 7221 that divides 7215 without a remainder.

1, 3, 29, 83, 87, 249, 2407

Final Step: Biggest Common Factor Number

We found the factors and prime factorization of 7215 and 7221. The biggest common factor number is the GCF number.
So the greatest common factor 7215 and 7221 is 3.

Also check out the Least Common Multiple of 7215 and 7221