1220222218 has 32 divisors (see below), whose sum is σ = 1959552000. Its totient is φ = 568212480.

The previous prime is 1220222177. The next prime is 1220222219. The reversal of 1220222218 is 8122220221.

It is a super-2 number, since 2×1220222218² = 2977884522601679048, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1220222219) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 645018 + ... + 646906.

It is an arithmetic number, because the mean of its divisors is an integer number (61236000).

Almost surely, 2^1220222218 is an apocalyptic number.

1220222218 is a deficient number, since it is larger than the sum of its proper divisors (739329782).

1220222218 is a wasteful number, since it uses less digits than its factorization.

1220222218 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2190.

The product of its (nonzero) digits is 512, while the sum is 22.

The square root of 1220222218 is about 34931.6792897221. The cubic root of 1220222218 is about 1068.5946023140.

Adding to 1220222218 its reverse (8122220221), we get a palindrome (9342442439).

The spelling of 1220222218 in words is "one billion, two hundred twenty million, two hundred twenty-two thousand, two hundred eighteen".