21595990404 has 48 divisors (see below), whose sum is σ = 50879015936. Its totient is φ = 7129188000.

The previous prime is 21595990391. The next prime is 21595990411. The reversal of 21595990404 is 40409959512.

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, 581769 + ... + 617775.

Almost surely, 2^21595990404 is an apocalyptic number.

It is an amenable number.

21595990404 is an abundant number, since it is smaller than the sum of its proper divisors (29283025532).

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

21595990404 is a wasteful number, since it uses less digits than its factorization.

21595990404 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36496 (or 36494 counting only the distinct ones).

The product of its (nonzero) digits is 583200, while the sum is 48.

The spelling of 21595990404 in words is "twenty-one billion, five hundred ninety-five million, nine hundred ninety thousand, four hundred four".