21044513204 has 48 divisors (see below), whose sum is σ = 43912188096. Its totient is φ = 8698060800.

The previous prime is 21044513141. The next prime is 21044513239. The reversal of 21044513204 is 40231544012.

It is a Harshad number since it is a multiple of its sum of digits (26).

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, 236237 + ... + 312884.

It is an arithmetic number, because the mean of its divisors is an integer number (914837252).

Almost surely, 2^21044513204 is an apocalyptic number.

It is an amenable number.

21044513204 is an abundant number, since it is smaller than the sum of its proper divisors (22867674892).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21044513204 is a wasteful number, since it uses less digits than its factorization.

21044513204 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 549216 (or 549214 counting only the distinct ones).

The product of its (nonzero) digits is 3840, while the sum is 26.

The spelling of 21044513204 in words is "twenty-one billion, forty-four million, five hundred thirteen thousand, two hundred four".