21908055166 has 16 divisors (see below), whose sum is σ = 33774762240. Its totient is φ = 10653940440.

The previous prime is 21908055157. The next prime is 21908055173. The reversal of 21908055166 is 66155080912.

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, 1024180 + ... + 1045351.

It is an arithmetic number, because the mean of its divisors is an integer number (2110922640).

Almost surely, 2^21908055166 is an apocalyptic number.

21908055166 is a deficient number, since it is larger than the sum of its proper divisors (11866707074).

21908055166 is a wasteful number, since it uses less digits than its factorization.

21908055166 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2069679.

The product of its (nonzero) digits is 129600, while the sum is 43.

The spelling of 21908055166 in words is "twenty-one billion, nine hundred eight million, fifty-five thousand, one hundred sixty-six".