The Number

21

Twenty-One

In Base 17 Septendecimal Is

1417

The numbers with a 17 subscript use Base 17 Septendecimal notation.

For more familiar numbers: See Twenty-One in Base 10 Decimal

Nearby Numbers

Positive, nonzero integers within three units

18
1117
Eightteen in Base 17 Septendecimal
19
1217
Nineteen in Base 17 Septendecimal
20
1317
Twenty in Base 17 Septendecimal
22
1517
Twenty-Two in Base 17 Septendecimal
23
1617
Twenty-Three in Base 17 Septendecimal
24
1717
Twenty-Four in Base 17 Septendecimal

Scientific Notation

Scientific notation expresses a quantity as the product of its significand with 10 raised to an integer exponent.

2.1e1

Reciprocal

A number multiplied with its reciprocal is one.

0.0dcg340dcg340e17

The reciprocal of 21 in Base 17 Septendecimal.

Palindrome?

A numerical palindrome has the same value when all of its digits are reversed.

The number 1417 is not a palindrome.

Not A Prime Number

A prime number is a positive integer that is divisible only by itself and one.

Twenty-one is a composite number with 4 total factors (including 1 and itself).   See primes in Base 17 Septendecimal

A Composite

Composites have more than just these two factors.

Twenty-one is a composite number with 4 total factors (including 1 and itself).

Prime Factors

The prime factors of a positive integer are the integers that divide it exactly and are also prime.

The number twenty-one has the following 2 prime factors:

3
317
Three in Base 17 Septendecimal
7
717
Seven in Base 17 Septendecimal

Prime Factorization

The prime factorization of a positive integer is the unique list of prime factors together with their multiplicities

3171 · 7171 = 1417

Base Conversions

The number twenty-one in 35 different bases