22218066 has 24 divisors (see below), whose sum is σ = 51842700. Its totient is φ = 6836256.

The previous prime is 22218059. The next prime is 22218067. The reversal of 22218066 is 66081222.

It can be written as a sum of positive squares in 2 ways, for example, as 19053225 + 3164841 = 4365^2 + 1779^2 .

It is not an unprimeable number, because it can be changed into a prime (22218067) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 47241 + ... + 47708.

Almost surely, 2^22218066 is an apocalyptic number.

22218066 is a gapful number since it is divisible by the number (26) formed by its first and last digit.

22218066 is an abundant number, since it is smaller than the sum of its proper divisors (29624634).

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

22218066 is a wasteful number, since it uses less digits than its factorization.

22218066 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 94970 (or 94967 counting only the distinct ones).

The product of its (nonzero) digits is 2304, while the sum is 27.

The square root of 22218066 is about 4713.6043533585. The cubic root of 22218066 is about 281.1266932065.

Adding to 22218066 its reverse (66081222), we get a palindrome (88299288).

The spelling of 22218066 in words is "twenty-two million, two hundred eighteen thousand, sixty-six".