What is the Greatest Common Factor of 21021 and 21040?

Greatest common factor (GCF) of 21021 and 21040 is 1.

GCF(21021,21040) = 1

We will now calculate the prime factors of 21021 and 21040, than find the greatest common factor (greatest common divisor (gcd)) of the numbers by matching the biggest common factor of 21021 and 21040.

How to find the GCF of 21021 and 21040?

We will first find the prime factorization of 21021 and 21040. After we will calculate the factors of 21021 and 21040 and find the biggest common factor number .

Step-1: Prime Factorization of 21021

Prime factors of 21021 are 3, 7, 11, 13. Prime factorization of 21021 in exponential form is:

21021 = 3¹ × 7² × 11¹ × 13¹

Step-2: Prime Factorization of 21040

Prime factors of 21040 are 2, 5, 263. Prime factorization of 21040 in exponential form is:

21040 = 2⁴ × 5¹ × 263¹

Step-3: Factors of 21021

List of positive integer factors of 21021 that divides 21021 without a remainder.

1, 3, 7, 11, 13, 21, 33, 39, 49, 77, 91, 143, 147, 231, 273, 429, 539, 637, 1001, 1617, 1911, 3003, 7007

Step-4: Factors of 21040

List of positive integer factors of 21040 that divides 21021 without a remainder.

1, 2, 4, 5, 8, 10, 16, 20, 40, 80, 263, 526, 1052, 1315, 2104, 2630, 4208, 5260, 10520

Final Step: Biggest Common Factor Number

We found the factors and prime factorization of 21021 and 21040. The biggest common factor number is the GCF number.
So the greatest common factor 21021 and 21040 is 1.

Also check out the Least Common Multiple of 21021 and 21040