The Number

15

Fifteen

In Base 21 Unovigesimal Is

f21

The numbers with a 21 subscript use Base 21 Unovigesimal notation.

For more familiar numbers: See Fifteen in Base 10 Decimal

Nearby Numbers

Positive, nonzero integers within three units

12
c21
Twelve in Base 21 Unovigesimal
13
d21
Thirteen in Base 21 Unovigesimal
14
e21
Fourteen in Base 21 Unovigesimal
16
g21
Sixteen in Base 21 Unovigesimal
17
h21
Seventeen in Base 21 Unovigesimal
18
i21
Eightteen in Base 21 Unovigesimal

Scientific Notation

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

1.5e1

Reciprocal

A number multiplied with its reciprocal is one.

0.188888888888821

The reciprocal of 15 in Base 21 Unovigesimal.

Palindrome?

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

The number f21 is a palindrome.

Not A Prime Number

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

Fifteen is a composite number with 4 total factors (including 1 and itself).   See primes in Base 21 Unovigesimal

A Composite

Composites have more than just these two factors.

Fifteen 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 fifteen has the following 2 prime factors:

3
321
Three in Base 21 Unovigesimal
5
521
Five in Base 21 Unovigesimal

Prime Factorization

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

3211 · 5211 = f21

Base Conversions

The number fifteen in 35 different bases