21503869604 has 12 divisors (see below), whose sum is σ = 43007739264. Its totient is φ = 9215944104.

The previous prime is 21503869579. The next prime is 21503869637. The reversal of 21503869604 is 40696830512.

21503869604 is an admirable number.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 383997644 + ... + 383997699.

It is an arithmetic number, because the mean of its divisors is an integer number (3583978272).

Almost surely, 2^21503869604 is an apocalyptic number.

It is an amenable number.

21503869604 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

21503869604 is a wasteful number, since it uses less digits than its factorization.

21503869604 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 767995354 (or 767995352 counting only the distinct ones).

The product of its (nonzero) digits is 311040, while the sum is 44.

The spelling of 21503869604 in words is "twenty-one billion, five hundred three million, eight hundred sixty-nine thousand, six hundred four".