21312883 has 12 divisors (see below), whose sum is σ = 23430240. Its totient is φ = 19359872.

The previous prime is 21312877. The next prime is 21312887. The reversal of 21312883 is 38821312.

It is not a de Polignac number, because 21312883 - 2²¹ = 19215731 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21312887) 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 in 11 ways as a sum of consecutive naturals, for example, 7110 + ... + 9652.

It is an arithmetic number, because the mean of its divisors is an integer number (1952520).

Almost surely, 2^21312883 is an apocalyptic number.

21312883 is a deficient number, since it is larger than the sum of its proper divisors (2117357).

21312883 is a wasteful number, since it uses less digits than its factorization.

21312883 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2606 (or 2589 counting only the distinct ones).

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

The square root of 21312883 is about 4616.5878091941. The cubic root of 21312883 is about 277.2558597249.

The spelling of 21312883 in words is "twenty-one million, three hundred twelve thousand, eight hundred eighty-three".