22171986 has 24 divisors (see below), whose sum is σ = 48509760. Its totient is φ = 7318296.

The previous prime is 22171937. The next prime is 22171987. The reversal of 22171986 is 68917122.

It is a self number, because there is not a number n which added to its sum of digits gives 22171986.

It is not an unprimeable number, because it can be changed into a prime (22171987) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 4126 + ... + 7833.

It is an arithmetic number, because the mean of its divisors is an integer number (2021240).

Almost surely, 2^22171986 is an apocalyptic number.

22171986 is an abundant number, since it is smaller than the sum of its proper divisors (26337774).

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

22171986 is a wasteful number, since it uses less digits than its factorization.

22171986 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12070 (or 12067 counting only the distinct ones).

The product of its digits is 12096, while the sum is 36.

The square root of 22171986 is about 4708.7138371322. The cubic root of 22171986 is about 280.9322075710.

The spelling of 22171986 in words is "twenty-two million, one hundred seventy-one thousand, nine hundred eighty-six".