22097218 has 16 divisors (see below), whose sum is σ = 38941056. Its totient is φ = 9271440.

The previous prime is 22097213. The next prime is 22097219. The reversal of 22097218 is 81279022.

It is a self number, because there is not a number n which added to its sum of digits gives 22097218.

It is not an unprimeable number, because it can be changed into a prime (22097213) 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, 38346 + ... + 38917.

It is an arithmetic number, because the mean of its divisors is an integer number (2433816).

Almost surely, 2^22097218 is an apocalyptic number.

22097218 is a deficient number, since it is larger than the sum of its proper divisors (16843838).

22097218 is a wasteful number, since it uses less digits than its factorization.

22097218 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 77289.

The product of its (nonzero) digits is 4032, while the sum is 31.

The square root of 22097218 is about 4700.7678096243. The cubic root of 22097218 is about 280.6160669805.

The spelling of 22097218 in words is "twenty-two million, ninety-seven thousand, two hundred eighteen".