What is the Greatest Common Factor of 16815 and 16821?

Greatest common factor (GCF) of 16815 and 16821 is 3.

GCF(16815,16821) = 3

We will now calculate the prime factors of 16815 and 16821, than find the greatest common factor (greatest common divisor (gcd)) of the numbers by matching the biggest common factor of 16815 and 16821.

How to find the GCF of 16815 and 16821?

We will first find the prime factorization of 16815 and 16821. After we will calculate the factors of 16815 and 16821 and find the biggest common factor number .

Step-1: Prime Factorization of 16815

Prime factors of 16815 are 3, 5, 19, 59. Prime factorization of 16815 in exponential form is:

16815 = 3¹ × 5¹ × 19¹ × 59¹

Step-2: Prime Factorization of 16821

Prime factors of 16821 are 3, 7, 89. Prime factorization of 16821 in exponential form is:

16821 = 3³ × 7¹ × 89¹

Step-3: Factors of 16815

List of positive integer factors of 16815 that divides 16815 without a remainder.

1, 3, 5, 15, 19, 57, 59, 95, 177, 285, 295, 885, 1121, 3363, 5605

Step-4: Factors of 16821

List of positive integer factors of 16821 that divides 16815 without a remainder.

1, 3, 7, 9, 21, 27, 63, 89, 189, 267, 623, 801, 1869, 2403, 5607

Final Step: Biggest Common Factor Number

We found the factors and prime factorization of 16815 and 16821. The biggest common factor number is the GCF number.
So the greatest common factor 16815 and 16821 is 3.

Also check out the Least Common Multiple of 16815 and 16821