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1 It's an integer which is a whole number

2 It's an odd number

3 It's not divisible by 2 with no remainder

4 It's a perfect square when multiplied by itself

5 Its square root is an irrational number

6 It's a rational number

7 It's 21/1 expressed as a fraction

8 It's 21.0 expressed as a decimal

9 Its digital sum is 3

10 It's a composite number

11 Its prime factors are 3 and 7

12 Its composite factor is itself

13 It has 1 as a factor which is neither a prime or a composite number

14 It becomes 1 when raised to the power of zero

15 It remains the same when raised to the power of 1

16 It can form the perimeter of an equilateral triangle

17 It's 2.1*10^1 in scientific notation

18 Its equivalent fraction is 42/2

19 It's the sum of the dots on a dice

20 It belongs to the Hindu-Arabic numeral system

21 Its equivalent Roman number is XXI

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Related Questions

What are two mathematical facts about the number 21?

It is an odd number. It is not prime. Its factors are 1, 3, 7 and 21. It is positive.


What are some trivial fact for 21?

Here are some trivial facts about the number 21, there is a game named 21, Sammy Sosa's jersey was 21, 21 is the age of adulthood.


What is 13-21?

13-21 = -8


What is the score for 3 out of 24 wrong?

To find the score for getting 3 out of 24 questions wrong, you first determine the number of correct answers, which is 24 - 3 = 21. If the scoring is based on correct answers only, the score would be 21 out of 24. This can also be expressed as a percentage: (21/24) * 100 = 87.5%.


What is the score if you miss 4 out of 25 questions?

If you miss 4 out of 25 questions, you would have answered 21 questions correctly. To calculate your score, you would typically assign a certain number of points to each correct answer. For example, if each question is worth 1 point, your score would be 21 points out of a possible 25, resulting in a score of 84%.


What is 90 percent of 21 questions?

90% of 21 = 18.9So, in order to score 90% on a test with 21 questions,you can't miss more than two of them.


Why is 21 a composite number?

21 is composite number because it has more than one number that goes into it


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A composite number is a number that has more than two factors. The factors of 21 are 1, 3, 7, and 21. Therefore, 21 is a composite number.


What math facts about the number 21?

It is a triangular number In Roman numerals = XXI It is the sun of the first 6 numbers (1+2+3+4+5+6=21)


What is a high score on the OCI-R?

There is a reccomended cut-off score of 21. When you score higher tan 21 it means a presence of OCD


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A composite number is a number that has more than two factors. The factors of 21 are 1, 3, 7, and 21. Therefore, 21 is a composite number.


What are three mathematical facts about the number 20?

It is the successor of 19. It is the predecessor of 21. It is two time ten.