21389076964 has 24 divisors (see below), whose sum is σ = 40010963328. Its totient is φ = 9980055360.

The previous prime is 21389076931. The next prime is 21389077019. The reversal of 21389076964 is 46967098312.

It is a super-2 number, since 2×21389076964² (a number of 21 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2831472 + ... + 2839015.

It is an arithmetic number, because the mean of its divisors is an integer number (1667123472).

Almost surely, 2^21389076964 is an apocalyptic number.

It is an amenable number.

21389076964 is a deficient number, since it is larger than the sum of its proper divisors (18621886364).

21389076964 is a wasteful number, since it uses less digits than its factorization.

21389076964 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5670555 (or 5670553 counting only the distinct ones).

The product of its (nonzero) digits is 3919104, while the sum is 55.

The spelling of 21389076964 in words is "twenty-one billion, three hundred eighty-nine million, seventy-six thousand, nine hundred sixty-four".