21905952854832 has 80 divisors (see below), whose sum is σ = 62940270538080. Its totient is φ = 7294775862528.

The previous prime is 21905952854831. The next prime is 21905952854909. The reversal of 21905952854832 is 23845825950912.

21905952854832 is a `hidden beast` number, since 2 + 1 + 9 + 0 + 5 + 9 + 52 + 8 + 548 + 32 = 666.

It is a self number, because there is not a number n which added to its sum of digits gives 21905952854832.

It is not an unprimeable number, because it can be changed into a prime (21905952854831) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 24591123 + ... + 25466354.

It is an arithmetic number, because the mean of its divisors is an integer number (786753381726).

Almost surely, 2^{21905952854832} is an apocalyptic number.

It is an amenable number.

21905952854832 is an abundant number, since it is smaller than the sum of its proper divisors (41034317683248).

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

21905952854832 is a wasteful number, since it uses less digits than its factorization.

21905952854832 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 50058507 (or 50058495 counting only the distinct ones).

The product of its (nonzero) digits is 62208000, while the sum is 63.

The spelling of 21905952854832 in words is "twenty-one trillion, nine hundred five billion, nine hundred fifty-two million, eight hundred fifty-four thousand, eight hundred thirty-two".