21866906376 has 96 divisors (see below), whose sum is σ = 67704848640. Its totient is φ = 6245697024.

The previous prime is 21866906363. The next prime is 21866906381. The reversal of 21866906376 is 67360966812.

21866906376 is a `hidden beast` number, since 2 + 186 + 6 + 90 + 6 + 376 = 666.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2423265 + ... + 2432271.

It is an arithmetic number, because the mean of its divisors is an integer number (705258840).

Almost surely, 2^21866906376 is an apocalyptic number.

It is an amenable number.

21866906376 is an abundant number, since it is smaller than the sum of its proper divisors (45837942264).

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

21866906376 is a wasteful number, since it uses less digits than its factorization.

21866906376 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13843 (or 13836 counting only the distinct ones).

The product of its (nonzero) digits is 3919104, while the sum is 54.

The spelling of 21866906376 in words is "twenty-one billion, eight hundred sixty-six million, nine hundred six thousand, three hundred seventy-six".