21904893912 has 32 divisors (see below), whose sum is σ = 59740620480. Its totient is φ = 6637846560.

The previous prime is 21904893863. The next prime is 21904893937. The reversal of 21904893912 is 21939840912.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 41486278 + ... + 41486805.

It is an arithmetic number, because the mean of its divisors is an integer number (1866894390).

Almost surely, 2^21904893912 is an apocalyptic number.

21904893912 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

21904893912 is an abundant number, since it is smaller than the sum of its proper divisors (37835726568).

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

21904893912 is a wasteful number, since it uses less digits than its factorization.

21904893912 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 82973103 (or 82973099 counting only the distinct ones).

The product of its (nonzero) digits is 279936, while the sum is 48.

The spelling of 21904893912 in words is "twenty-one billion, nine hundred four million, eight hundred ninety-three thousand, nine hundred twelve".