The Number
13
Thirteen
In Base 21 Unovigesimal Is
d21
The numbers with a 21 subscript use Base 21 Unovigesimal notation.
For more familiar numbers: See Thirteen in Base 10 Decimal
Nearby Numbers
Positive, nonzero integers within three units
Scientific Notation
Scientific notation expresses a quantity as the product of its significand with 10 raised to an integer exponent.
1.3e1
Reciprocal
A number multiplied with its reciprocal is one.
0.1cj81cj81cj8221
The reciprocal of 13 in Base 21 Unovigesimal.
Palindrome?
A numerical palindrome has the same value when all of its digits are reversed.
The number d21 is a palindrome.
A Prime Number
A prime number is a positive integer that is divisible only by itself and one.
Thirteen is the 6th prime number. See primes in Base 21 Unovigesimal
Not A Composite
Composites have more than just these two factors.
Thirteen is not a composite number because it has exactly two factors: One and Thirteen
Prime Factors
The number thirteen has the following 1 prime factor:
Prime Factorization
The prime factorization of a positive integer is the unique list of prime factors together with their multiplicities
d211
= d21
Base Conversions
The number thirteen in 35 different bases