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# What is a common prime factor of 21 and 411?

Updated: 4/16/2024

Wiki User

8y ago

It is 3 that is a common prime factor to both numbers

Wiki User

8y ago

Bridgette Maponya

Lvl 1
2y ago
Yes

Onkgopotse Koloane

Lvl 1
7mo ago
what are composite factors of 36

Vanessa Malibu

Lvl 2
1y ago

3

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Q: What is a common prime factor of 21 and 411?
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### Common prime factor 21and 411?

The common prime factors of 21 and 411 are 1. Steps to solve: Multiply the numbers: 21×411=8631 Answer: 8631

3

It is 3

### What is the greatest common factor of 6 15 and 21?

The greatest common factor of 6, 15 and 21 is 3. The prime factorization of 6 is 2*3 The prime factorization of 15 is 3*5 The prime factorization of 21 is 3*7 The GCF is then 3, as it is the only common factor.

### What is the greatest common factor of 8 21 and 75?

the greatest common factor of 8 21 and 75 is 1.

### What is the greatest common factor of 21 and 121?

The greatest common factor of 21 and 121 is 1. (21 and 121 are relatively prime.)

### What is th gratest common factor of 42 and 105?

42 prime factors -----&gt; 2,3,7 105 prime factors -----&gt; 3,5,7 There is 3 and 7 in common : There fore 3*7 = 21; 21 is the greatest common factor.

### What is the greatest common factor for 21 and 36?

The factors of 21 are 1, 3, 7, and 21. The factors of 36 are 1, 2, 3, 4, 6, 9, 12, 18, and 36. The factors they have in common are 1 and 3, the largest of which is 3, so 3 is the greatest common factor. Or, you can calculate the greatest common factor by looking at the prime factors. The prime factors of 21 are 3 and 7. The prime factors of 36 are 2, 2, 3, and 3. The prime factors they have in common are a single 3, so 3 is the greatest common factor.

### What is the greatest common factor of 21 and 56?

The greatest, (Highest) Common Factor of 21 and 56 is 7

### What is the greatest common factor of 29 and 21?

The greatest common factor of 21 and 29 is 1 GCF(21, 29) = 1. The numbers are co-prime.

### What is the greatest common factor of 21 and 45?

The GCF of 21 and 45 is 3. One way to determine the greatest common factor is to find all the factors of the numbers and compare them. The factors of 21 are 1, 3, 7, and 21. The factors of 45 are 1, 3, 5, 9, 15, and 45. The common factors are 1 and 3. Therefore, the greatest common factor is 3. The greatest common factor can also be calculated by identifying the common prime factors and multiplying them together. The prime factors of 21 are 3 and 7. The prime factors of 45 are 3, 3, and 5. The prime factors in common are a single 3, so the greatest common factor is 3.

### Are 4 and 21 relatively prime?

Yes, 4 and 21 are relatively prime. Numbers that are relatively prime only have the number 1 as a common factor. That is the case with 4 and 21.