222218684 has 12 divisors (see below), whose sum is σ = 389161584. Its totient is φ = 111029664.

The previous prime is 222218657. The next prime is 222218687. The reversal of 222218684 is 486812222.

It is a super-2 number, since 2×222218684² = 98762287037383712, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (222218687) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 13409 + ... + 24984.

It is an arithmetic number, because the mean of its divisors is an integer number (32430132).

Almost surely, 2^222218684 is an apocalyptic number.

It is an amenable number.

222218684 is a deficient number, since it is larger than the sum of its proper divisors (166942900).

222218684 is a wasteful number, since it uses less digits than its factorization.

222218684 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 39844 (or 39842 counting only the distinct ones).

The product of its digits is 24576, while the sum is 35.

The square root of 222218684 is about 14907.0011739451. The cubic root of 222218684 is about 605.7036495721.

Subtracting from 222218684 its sum of digits (35), we obtain a square (222218649 = 14907²).

The spelling of 222218684 in words is "two hundred twenty-two million, two hundred eighteen thousand, six hundred eighty-four".