The Number

21

Twenty-One

In Base 27 Heptavigesimal Is

l27

The numbers with a 27 subscript use Base 27 Heptavigesimal notation.

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

Nearby Numbers

Positive, nonzero integers within three units

18
i27
Eightteen in Base 27 Heptavigesimal
19
j27
Nineteen in Base 27 Heptavigesimal
20
k27
Twenty in Base 27 Heptavigesimal
22
m27
Twenty-Two in Base 27 Heptavigesimal
23
n27
Twenty-Three in Base 27 Heptavigesimal
24
o27
Twenty-Four in Base 27 Heptavigesimal

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.

0.17j7j7j7j7j727

The reciprocal of 21 in Base 27 Heptavigesimal.

Palindrome?

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

The number l27 is 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 27 Heptavigesimal

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
327
Three in Base 27 Heptavigesimal
7
727
Seven in Base 27 Heptavigesimal

Prime Factorization

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

3271 · 7271 = l27

Base Conversions

The number twenty-one in 35 different bases