21904813030 has 32 divisors (see below), whose sum is σ = 39971232000. Its totient is φ = 8641712352.

The previous prime is 21904813019. The next prime is 21904813057. The reversal of 21904813030 is 3031840912.

It is a junction number, because it is equal to n+sod(n) for n = 21904812983 and 21904813001.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 475141 + ... + 519199.

It is an arithmetic number, because the mean of its divisors is an integer number (1249101000).

Almost surely, 2^21904813030 is an apocalyptic number.

21904813030 is a deficient number, since it is larger than the sum of its proper divisors (18066418970).

21904813030 is a wasteful number, since it uses less digits than its factorization.

21904813030 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 44748.

The product of its (nonzero) digits is 5184, while the sum is 31.

The spelling of 21904813030 in words is "twenty-one billion, nine hundred four million, eight hundred thirteen thousand, thirty".