1216222222 has 16 divisors (see below), whose sum is σ = 1853403840. Its totient is φ = 598470912.

The previous prime is 1216222199. The next prime is 1216222229. The reversal of 1216222222 is 2222226121.

1216222222 is a modest number, since divided by 22222 gives 12162 as remainder.

It is a junction number, because it is equal to n+sod(n) for n = 1216222193 and 1216222202.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1216222229) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 37158 + ... + 61750.

It is an arithmetic number, because the mean of its divisors is an integer number (115837740).

Almost surely, 2^1216222222 is an apocalyptic number.

1216222222 is a deficient number, since it is larger than the sum of its proper divisors (637181618).

1216222222 is a wasteful number, since it uses less digits than its factorization.

1216222222 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24987.

The product of its digits is 768, while the sum is 22.

The square root of 1216222222 is about 34874.3777292155. The cubic root of 1216222222 is about 1067.4256749968.

Adding to 1216222222 its reverse (2222226121), we get a palindrome (3438448343).

The spelling of 1216222222 in words is "one billion, two hundred sixteen million, two hundred twenty-two thousand, two hundred twenty-two".