What is the Greatest Common Factor of 1221 and 1230?

Greatest common factor (GCF) of 1221 and 1230 is 3.

GCF(1221,1230) = 3

We will now calculate the prime factors of 1221 and 1230, than find the greatest common factor (greatest common divisor (gcd)) of the numbers by matching the biggest common factor of 1221 and 1230.

How to find the GCF of 1221 and 1230?

We will first find the prime factorization of 1221 and 1230. After we will calculate the factors of 1221 and 1230 and find the biggest common factor number .

Step-1: Prime Factorization of 1221

Prime factors of 1221 are 3, 11, 37. Prime factorization of 1221 in exponential form is:

1221 = 3¹ × 11¹ × 37¹

Step-2: Prime Factorization of 1230

Prime factors of 1230 are 2, 3, 5, 41. Prime factorization of 1230 in exponential form is:

1230 = 2¹ × 3¹ × 5¹ × 41¹

Step-3: Factors of 1221

List of positive integer factors of 1221 that divides 1221 without a remainder.

1, 3, 11, 33, 37, 111, 407

Step-4: Factors of 1230

List of positive integer factors of 1230 that divides 1221 without a remainder.

1, 2, 3, 5, 6, 10, 15, 30, 41, 82, 123, 205, 246, 410, 615

Final Step: Biggest Common Factor Number

We found the factors and prime factorization of 1221 and 1230. The biggest common factor number is the GCF number.
So the greatest common factor 1221 and 1230 is 3.

Also check out the Least Common Multiple of 1221 and 1230