The Number
21557
Twenty-One Thousand Five Hundred and Fifty-Seven
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.
2.1557e4
Reciprocal
A number multiplied with its reciprocal is one.
0.000046388644059934126
The reciprocal of 21557.
Palindrome?
A numerical palindrome has the same value when all of its digits are reversed.
The number 21557 is not a palindrome.
A Prime Number
A prime number is a positive integer that is divisible only by itself and one.
Twenty-one thousand five hundred and fifty-seven is the 2418th prime number. See primes in Base 10 Decimal
Not A Composite
Composites have more than just these two factors.
Twenty-One Thousand Five Hundred and Fifty-Seven is not a composite number because it has exactly two factors: One and Twenty-One Thousand Five Hundred and Fifty-Seven
Prime Factors
The number twenty-one thousand five hundred and fifty-seven 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
215571
= 21557
Base Conversions
The number twenty-one thousand five hundred and fifty-seven in 35 different bases