What is the Greatest Common Factor of 1221 and 1227?

Greatest common factor (GCF) of 1221 and 1227 is 3.

GCF(1221,1227) = 3

We will now calculate the prime factors of 1221 and 1227, than find the greatest common factor (greatest common divisor (gcd)) of the numbers by matching the biggest common factor of 1221 and 1227.

How to find the GCF of 1221 and 1227?

We will first find the prime factorization of 1221 and 1227. After we will calculate the factors of 1221 and 1227 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 1227

Prime factors of 1227 are 3, 409. Prime factorization of 1227 in exponential form is:

1227 = 3¹ × 409¹

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 1227

List of positive integer factors of 1227 that divides 1221 without a remainder.

1, 3, 409

Final Step: Biggest Common Factor Number

We found the factors and prime factorization of 1221 and 1227. The biggest common factor number is the GCF number.
So the greatest common factor 1221 and 1227 is 3.

Also check out the Least Common Multiple of 1221 and 1227