22218556 has 12 divisors (see below), whose sum is σ = 39831120. Its totient is φ = 10838240.

The previous prime is 22218551. The next prime is 22218557. The reversal of 22218556 is 65581222.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22218551) 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, 67576 + ... + 67903.

It is an arithmetic number, because the mean of its divisors is an integer number (3319260).

Almost surely, 2^22218556 is an apocalyptic number.

It is an amenable number.

22218556 is a deficient number, since it is larger than the sum of its proper divisors (17612564).

22218556 is a wasteful number, since it uses less digits than its factorization.

22218556 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 135524 (or 135522 counting only the distinct ones).

The product of its digits is 9600, while the sum is 31.

The square root of 22218556 is about 4713.6563302812. The cubic root of 22218556 is about 281.1287598590.

Adding to 22218556 its reverse (65581222), we get a palindrome (87799778).

The spelling of 22218556 in words is "twenty-two million, two hundred eighteen thousand, five hundred fifty-six".