21922618 has 16 divisors (see below), whose sum is σ = 35461440. Its totient is φ = 10130400.

The previous prime is 21922597. The next prime is 21922619. The reversal of 21922618 is 81622912.

It is a self number, because there is not a number n which added to its sum of digits gives 21922618.

It is not an unprimeable number, because it can be changed into a prime (21922619) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5478 + ... + 8593.

It is an arithmetic number, because the mean of its divisors is an integer number (2216340).

Almost surely, 2^21922618 is an apocalyptic number.

21922618 is a deficient number, since it is larger than the sum of its proper divisors (13538822).

21922618 is a wasteful number, since it uses less digits than its factorization.

21922618 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14133.

The product of its digits is 3456, while the sum is 31.

The square root of 21922618 is about 4682.1595444837. The cubic root of 21922618 is about 279.8750207539.

The spelling of 21922618 in words is "twenty-one million, nine hundred twenty-two thousand, six hundred eighteen".