21032555868 has 36 divisors (see below), whose sum is σ = 53504276280. Its totient is φ = 6966194976.

The previous prime is 21032555849. The next prime is 21032555879. The reversal of 21032555868 is 86855523012.

21032555868 is a `hidden beast` number, since 2 + 1 + 0 + 32 + 5 + 558 + 68 = 666.

It is a tau number, because it is divible by the number of its divisors (36).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1854978 + ... + 1866281.

Almost surely, 2^21032555868 is an apocalyptic number.

It is an amenable number.

21032555868 is an abundant number, since it is smaller than the sum of its proper divisors (32471720412).

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

21032555868 is a wasteful number, since it uses less digits than its factorization.

21032555868 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3721426 (or 3721421 counting only the distinct ones).

The product of its (nonzero) digits is 576000, while the sum is 45.

The spelling of 21032555868 in words is "twenty-one billion, thirty-two million, five hundred fifty-five thousand, eight hundred sixty-eight".