22168891 has 4 divisors (see below), whose sum is σ = 22199472. Its totient is φ = 22138312.

The previous prime is 22168889. The next prime is 22168919. The reversal of 22168891 is 19886122.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 22168891 - 2¹ = 22168889 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 22168891.

It is not an unprimeable number, because it can be changed into a prime (22168831) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 14176 + ... + 15661.

It is an arithmetic number, because the mean of its divisors is an integer number (5549868).

Almost surely, 2^22168891 is an apocalyptic number.

22168891 is a deficient number, since it is larger than the sum of its proper divisors (30581).

22168891 is an equidigital number, since it uses as much as digits as its factorization.

22168891 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30580.

The product of its digits is 13824, while the sum is 37.

The square root of 22168891 is about 4708.3851796555. The cubic root of 22168891 is about 280.9191351344.

The spelling of 22168891 in words is "twenty-two million, one hundred sixty-eight thousand, eight hundred ninety-one".