Q: What are 21 digit numbers called?

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There are 21 two-digit prime numbers.

21, 51, 81, 91.

3 digit numbers are lessthan 4 digit numbers

In any two-digit multiplication sum, for example, 3 x 2 = 6, the first digit is called the multiplier, the second digit is called a multiplicand, and the third digit, the answer, is the product.

A 12-digit number, I would guess.

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There are 21 two-digit prime numbers.

-21

there are 50 prime numbers between 1-100 and of them 2,3,5,7 are single digit so that would leave 46 double digit prime numbers between 1-100

42 of them.

21

21.

21

21 of them.

Generally speaking, when writing out numbers in words between 21 and 99 in English, hyphens are used between the tens digit and units digit. This contrasts with a language such as Italian, where numbers between 21 and 99 are written as single words, without hyphens, for example, the word for the number 32 is trentadue.

11's of quintillion's

12 x 12 = 144 21 x 21 = 441 29 x 29 = 841 As you may have noticed, all these 3 digit square numbers have a 4 as the second digit. Hope this helped

3 digit numbers are lessthan 4 digit numbers