21231883 has 2 divisors, whose sum is σ = 21231884. Its totient is φ = 21231882.

The previous prime is 21231877. The next prime is 21231893. The reversal of 21231883 is 38813212.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21231883 - 2⁵ = 21231851 is a prime.

It is not a weakly prime, because it can be changed into another prime (21231823) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10615941 + 10615942.

It is an arithmetic number, because the mean of its divisors is an integer number (10615942).

Almost surely, 2^21231883 is an apocalyptic number.

21231883 is a deficient number, since it is larger than the sum of its proper divisors (1).

21231883 is an equidigital number, since it uses as much as digits as its factorization.

21231883 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2304, while the sum is 28.

The square root of 21231883 is about 4607.8067450795. The cubic root of 21231883 is about 276.9041751720.

The spelling of 21231883 in words is "twenty-one million, two hundred thirty-one thousand, eight hundred eighty-three".