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Yes, 21 is a natural number. Natural numbers are the set of positive integers starting from 1, and they include all whole numbers like 1, 2, 3, and so on. Since 21 is a positive integer, it qualifies as a natural number.

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1mo ago

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Related Questions

Is the square root of 21 a natural number?

No, the square root of 21 is not a natural number. Natural numbers are positive integers (1, 2, 3, ...), and the square root of 21 is approximately 4.58, which is not an integer. Therefore, it does not qualify as a natural number.


The arithmetic mean of the first 20 even natural number is?

21


What is a square of a natural number 1-20?

21


What is the smallest number that is divisible by 7 15 and 21?

If it needs to be natural it is one.


Is negative 21 a whole or natural?

It is a negative whole number which is the same as an integer


Is 21 a primenumber?

No, 21 is not a prime number. A prime number is defined as a natural number greater than 1 that has no positive divisors other than 1 and itself. Since 21 can be divided evenly by 1, 3, 7, and 21, it has divisors other than 1 and itself, making it a composite number.


Definition of a multiple of 21?

For any natural number k, 21k is a multiple of k.So for example, if k=1, 21 is the first multiple.Now if k=2, we have 42 which is the next one.In fact for any number n, and any natural number k, kn is a multiple of n.


Is the square root of 5 and squa re root of 21 irrational?

Yes. The square root of a natural number (positive integer) is either an integer, or an irrational number.


What are the release dates for The Natural Kingdom - 2003 21-Jan 1-21?

The Natural Kingdom - 2003 21-Jan 1-21 was released on: USA: June 2003


What is the composite number for 21?

The only composite factor of 21 is 21.


What is Negative eight times the sum of a number and 21 is 96?

-8 × (number + 21) = 96 → number + 21 = 96 ÷ -8 → number = 96 ÷ -8 - 21 = -12 - 21 = -33


Is 0.32 a natural number?

no..a natural number is a whole number