The components of 21 room the numbers that create the result as 21 once a pair element is multiply together. A aspect of a number divides the original number uniformly. 

The determinants of 21 space 1, 3, 7 and 21. 

Factor bag of the number 21 space the numbers that an outcome in the original number multiplying them together. To uncover the factors of a number, 21, we can use the administrate method.

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How to discover the determinants of 21?

Go with the adhering to steps to find factors of 21.

Step 1: First, write the number 21

Step 2: uncover the two numbers, which outcomes in 21 under the multiplication, say 3 and 7, such that 3 × 7 = 21.

Step 3: We recognize that 3 and also 7 are prime numbers with only two factors, i.e., one and the number itself. 

The determinants of 3 = 3 × 1

The determinants of 7 = 7 x 1

So, us cannot more factorize them.

Step 4: Therefore, the administrate of 21 can be expressed together 21 = 3 × 7 × 1

Step 7: Finally, write down all the unique numbers which we can achieve from the over process.


Factors that 21

1, 3, 7, and also 21

Pair factors of 21

To find the pair factors of 21, multiply the 2 numbers to acquire the original number as 21. We have the right to write both positive and an adverse integers in bag as presented below:


Positive pairsNegative pairs
1 × 21 = 21; (1, 21)(-1) × (-21) = 21; (-1, -21)
3 × 7 = 21; (3, 7)(-3) × (-7) = 21; (-3, -7)
7 × 3 = 21; (7, 3)(-7) × (-3) = 21; (-7, -3)
21 × 1 = 21; (21, 1)(-21) × (-1) = 21; (-21, -1)

Therefore, the hopeful pair components of 21 are (1, 21), (3, 7), (7, 3) and (21, 1)

The an unfavorable pair components of 21 are (-1, -21), (-3, -7), (-7, -3) and also (-21, -1).

Prime determinants of 21

As us know, 21 is a composite number, and also it has actually prime factors. Now let us uncover the prime components of 21.

The an initial step is to division the number 21 through the smallest prime number, i.e. 2.

21 ÷ 2 = 10.5

Factors should be entirety numbers, therefore 2 can not be the aspect of 21. Hence, proceed with the following prime number, i.e. 3.

21 ÷ 3 = 7

Thus, 3 is among the prime factors of 21.

Now, division 7 by the number which are prime.

7 ÷ 2 = 3.5

7 ÷ 3 = 2.333

7 ÷÷ 5 = 1.4

7 ÷ 7 = 1

We have received number 1 in ~ the finish of the department process; thus, we cannot continue further. 

So, the prime determinants of 21 are 3 and 7, where 2 and 7 space the prime numbers.

Prime factorisation of 21 is 3 × 7.

Some the the essential facts around the components of 21 are listed below:

The variety of factors that 21 is 4.The amount of all components of 21 is equal to 32.The product the all components of 21 is equal to square the 21 or 21 times of 21.

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Learn an ext about factors, multiples and also prime factors of other numbers, visit www.rebab.net also, download BYJU’S – The learning App.

Frequently Asked inquiries on factors of 21 – FAQs


What space the multiples and also factors that 21?


The multiples the 21 incorporate 21, 42, 63, 84, 105, 126, 147, 168, 189, 210, etc.,The determinants of 21 space 1, 3, 7 and also 21.

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What are multiples that 21?


The multiples that 21 space 21, 42, 63, 84, 105, 126, 147, 168, 189, 210, ….