22181916 has 24 divisors (see below), whose sum is σ = 52383744. Its totient is φ = 7304560.

The previous prime is 22181909. The next prime is 22181917. The reversal of 22181916 is 61918122.

It is a happy number.

It is a hoax number, since the sum of its digits (30) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22181917) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 10140 + ... + 12131.

It is an arithmetic number, because the mean of its divisors is an integer number (2182656).

Almost surely, 2^22181916 is an apocalyptic number.

It is an amenable number.

22181916 is an abundant number, since it is smaller than the sum of its proper divisors (30201828).

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

22181916 is a wasteful number, since it uses less digits than its factorization.

22181916 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22361 (or 22359 counting only the distinct ones).

The product of its digits is 1728, while the sum is 30.

The square root of 22181916 is about 4709.7681471597. The cubic root of 22181916 is about 280.9741409739.

The spelling of 22181916 in words is "twenty-two million, one hundred eighty-one thousand, nine hundred sixteen".