Factors of 21 are 1, 3, 7, and 21
Hence, Factors of 21 are 1, 3, 7, and 21
A prime number is a number that has exactly two factors, 1 and the number itself. Prime factorization of a number means breaking down of the number into the form of products of its prime factors.
There are two different methods that can be used for the prime factorization.
To find the primefactors of 21 using the division method, follow these steps:
So, the prime factorization of 21 is, 21 = 3 x 7.
We can follow the same procedure using the factor tree of 21 as shown below:
So, the prime factorization of 21 is, 21 = 3 x 7.
Pair factors of a number are any two numbers which, which on multiplying together, give that number as a result. The pair factors of 21 would be the two numbers which, when multiplied, give 21 as the result.
The following table represents the calculation of factors of 21 in pairs:
| Factor Pair | Pair Factorization |
|---|---|
| 1 and 21 | 1 x 21 = 21 |
| 3 and 7 | 3 x 7 = 21 |
Since the product of two negative numbers gives a positive number, the product of the negative values of both the numbers in a pair factor will also give 21. They are called negative pair factors.
Hence, the negative pairs of 21 would be ( -1 , -21 ) , ( -3 , -7 ) .
In mathematics a factor is a number which divides into another without leaving any remainder. Or we can say, any two numbers that multiply to give a product are both factors of that product. It can be both positive or negative.
The factors of 21 are 1, 3, 7, 21.Prime factors of 21 are 3, 7.
Two numbers that make 21 are 3 and 7.
The greatest prime factor of 21 is 7.
Factors of 21 are 1, 3, 7, 21.
Factors of -21 are -1, -3, -7, -21.
First five multiples of 21 are 42, 63, 84, 105, 126.
First five multiples of 21 are 42, 63, 84, 105.
No 21 is not a perfect square.
Two numbers that make 21 are 3 and 7.
Prime factorization of 21 is 3 x 7 = 3 x 7.
Factors of 21 are 1, 3, 7, 21.Prime factors of 21 are 3, 7
3 factor(s) of 21 are 1, 3, 7.
Prime factors of 21 are 3, 7.So in exponential form it can be written as 3 x 7.
Factors of 21 are 1, 3, 7, 21.So there are in total 4 factors.
Positive factors are 1, 3, 7, 21. Negative factors are -1, -3, -7, -21.
Factors of 21 are 1, 3, 7, 21.Even factors of 21 are 0.Hence, product of even factors of 21 is; 0 = 0.