21868518522 has 16 divisors (see below), whose sum is σ = 43929713952. Its totient is φ = 7257393360.

The previous prime is 21868518481. The next prime is 21868518577. The reversal of 21868518522 is 22581586812.

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, 8026729 + ... + 8029452.

It is an arithmetic number, because the mean of its divisors is an integer number (2745607122).

Almost surely, 2^21868518522 is an apocalyptic number.

21868518522 is an abundant number, since it is smaller than the sum of its proper divisors (22061195430).

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

21868518522 is a wasteful number, since it uses less digits than its factorization.

21868518522 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16056413.

The product of its digits is 614400, while the sum is 48.

The spelling of 21868518522 in words is "twenty-one billion, eight hundred sixty-eight million, five hundred eighteen thousand, five hundred twenty-two".