12222218 has 8 divisors (see below), whose sum is σ = 19411812. Its totient is φ = 5751616.

The previous prime is 12222211. The next prime is 12222241. The reversal of 12222218 is 81222221.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 9443329 + 2778889 = 3073^2 + 1667^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-2 number, since 2×12222218² = 298765225679048, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 12222218.

It is not an unprimeable number, because it can be changed into a prime (12222211) 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, 179705 + ... + 179772.

Almost surely, 2^12222218 is an apocalyptic number.

12222218 is a deficient number, since it is larger than the sum of its proper divisors (7189594).

12222218 is a wasteful number, since it uses less digits than its factorization.

12222218 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 359496.

The product of its digits is 256, while the sum is 20.

The square root of 12222218 is about 3496.0288900408. The cubic root of 12222218 is about 230.3474144755.

Adding to 12222218 its reverse (81222221), we get a palindrome (93444439).

The spelling of 12222218 in words is "twelve million, two hundred twenty-two thousand, two hundred eighteen".