The Number
11981
Eleven Thousand Nine Hundred and Eighty-One
In Base 21 Unovigesimal Is
163b21
The numbers with a 21 subscript use Base 21 Unovigesimal notation.
For more familiar numbers: See Eleven 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.
1.1981e4
Reciprocal
A number multiplied with its reciprocal is one.
0.000g4iaf7j664ak21
The reciprocal of 11981 in Base 21 Unovigesimal.
Palindrome?
A numerical palindrome has the same value when all of its digits are reversed.
The number 163b21 is not a palindrome.
A Prime Number
A prime number is a positive integer that is divisible only by itself and one.
Eleven thousand nine hundred and eighty-one is the 1437th prime number. See primes in Base 21 Unovigesimal
Not A Composite
Composites have more than just these two factors.
Eleven Thousand Nine Hundred and Eighty-One is not a composite number because it has exactly two factors: One and Eleven Thousand Nine Hundred and Eighty-One
Prime Factors
The number eleven thousand nine hundred and eighty-one 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
163b211
= 163b21
Base Conversions
The number eleven thousand nine hundred and eighty-one in 35 different bases