The Number
21981
Twenty-One Thousand Nine Hundred and Eighty-One
In Base 13 Tridecimal Is
a00b13
The numbers with a 13 subscript use Base 13 Tridecimal notation.
For more familiar numbers: See Twenty-One Thousand Nine Hundred and Eighty-One 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.
2.1981e4
Reciprocal
A number multiplied with its reciprocal is one.
0.00013b7894740248b9613
The reciprocal of 21981 in Base 13 Tridecimal.
Palindrome?
A numerical palindrome has the same value when all of its digits are reversed.
The number a00b13 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 thousand nine hundred and eighty-one is a composite number with 8 total factors (including 1 and itself). See primes in Base 13 Tridecimal
A Composite
Composites have more than just these two factors.
Twenty-one thousand nine hundred and eighty-one is a composite number with 8 total factors (including 1 and itself).
Prime Factors
The number twenty-one thousand nine hundred and eighty-one has the following 3 prime factors:
Prime Factorization
The prime factorization of a positive integer is the unique list of prime factors together with their multiplicities
3131
·
14131
·
272131
= a00b13
Base Conversions
The number twenty-one thousand nine hundred and eighty-one in 35 different bases