Nearby Numbers

Positive, nonzero integers within three units

21028

Twenty-One Thousand and Twenty-Eight

21029

Twenty-One Thousand and Twenty-Nine

21030

Twenty-One Thousand and Thirty

21032

Twenty-One Thousand and Thirty-Two

21033

Twenty-One Thousand and Thirty-Three

21034

Twenty-One Thousand and Thirty-Four

Scientific Notation

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

2.1031e4

Reciprocal

A number multiplied with its reciprocal is one.

0.000047548856450002375

The reciprocal of 21031.

Palindrome?

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

The number 21031 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 and thirty-one is the 2367th prime number.   See primes in Base 10 Decimal

Not A Composite

Composites have more than just these two factors.

Twenty-One Thousand and Thirty-One is not a composite number because it has exactly two factors: One and Twenty-One Thousand and Thirty-One

Prime Factors

21031

Twenty-One Thousand and Thirty-One

Prime Factorization

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

210311 = 21031

Base Conversions

The number twenty-one thousand and thirty-one in 35 different bases