What is the Greatest Common Factor of 67215 and 67221?

Greatest common factor (GCF) of 67215 and 67221 is 3.

GCF(67215,67221) = 3

We will now calculate the prime factors of 67215 and 67221, than find the greatest common factor (greatest common divisor (gcd)) of the numbers by matching the biggest common factor of 67215 and 67221.

How to find the GCF of 67215 and 67221?

We will first find the prime factorization of 67215 and 67221. After we will calculate the factors of 67215 and 67221 and find the biggest common factor number .

Step-1: Prime Factorization of 67215

Prime factors of 67215 are 3, 5, 4481. Prime factorization of 67215 in exponential form is:

67215 = 3¹ × 5¹ × 4481¹

Step-2: Prime Factorization of 67221

Prime factors of 67221 are 3, 7, 11, 97. Prime factorization of 67221 in exponential form is:

67221 = 3² × 7¹ × 11¹ × 97¹

Step-3: Factors of 67215

List of positive integer factors of 67215 that divides 67215 without a remainder.

1, 3, 5, 15, 4481, 13443, 22405

Step-4: Factors of 67221

List of positive integer factors of 67221 that divides 67215 without a remainder.

1, 3, 7, 9, 11, 21, 33, 63, 77, 97, 99, 231, 291, 679, 693, 873, 1067, 2037, 3201, 6111, 7469, 9603, 22407

Final Step: Biggest Common Factor Number

We found the factors and prime factorization of 67215 and 67221. The biggest common factor number is the GCF number.
So the greatest common factor 67215 and 67221 is 3.

Also check out the Least Common Multiple of 67215 and 67221