1222212112 has 20 divisors (see below), whose sum is σ = 2583312336. Its totient is φ = 555550880.

The previous prime is 1222212097. The next prime is 1222212113. The reversal of 1222212112 is 2112122221.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (16).

It is a nude number because it is divisible by every one of its digits.

It is not an unprimeable number, because it can be changed into a prime (1222212113) 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 3 ways as a sum of consecutive naturals, for example, 3472018 + ... + 3472369.

Almost surely, 2^1222212112 is an apocalyptic number.

It is an amenable number.

1222212112 is an abundant number, since it is smaller than the sum of its proper divisors (1361100224).

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

1222212112 is a wasteful number, since it uses less digits than its factorization.

1222212112 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6944406 (or 6944400 counting only the distinct ones).

The product of its digits is 64, while the sum is 16.

The square root of 1222212112 is about 34960.1503429262. The cubic root of 1222212112 is about 1069.1751619100.

Adding to 1222212112 its reverse (2112122221), we get a palindrome (3334334333).

The spelling of 1222212112 in words is "one billion, two hundred twenty-two million, two hundred twelve thousand, one hundred twelve".