21044164576 has 12 divisors (see below), whose sum is σ = 41430699072. Its totient is φ = 10522082272.

The previous prime is 21044164549. The next prime is 21044164591. The reversal of 21044164576 is 67546144012.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 328815040 + ... + 328815103.

It is an arithmetic number, because the mean of its divisors is an integer number (3452558256).

Almost surely, 2^21044164576 is an apocalyptic number.

It is an amenable number.

21044164576 is a deficient number, since it is larger than the sum of its proper divisors (20386534496).

21044164576 is an equidigital number, since it uses as much as digits as its factorization.

21044164576 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 657630153 (or 657630145 counting only the distinct ones).

The product of its (nonzero) digits is 161280, while the sum is 40.

The spelling of 21044164576 in words is "twenty-one billion, forty-four million, one hundred sixty-four thousand, five hundred seventy-six".