1221222112 has 48 divisors (see below), whose sum is σ = 2760912000. Its totient is φ = 525882240.

The previous prime is 1221222089. The next prime is 1221222113. The reversal of 1221222112 is 2112221221.

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 a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1221222113) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 84612 + ... + 97987.

It is an arithmetic number, because the mean of its divisors is an integer number (57519000).

Almost surely, 2^1221222112 is an apocalyptic number.

It is an amenable number.

1221222112 is an abundant number, since it is smaller than the sum of its proper divisors (1539689888).

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

1221222112 is a wasteful number, since it uses less digits than its factorization.

1221222112 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 182639 (or 182631 counting only the distinct ones).

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

The square root of 1221222112 is about 34945.9884965356. The cubic root of 1221222112 is about 1068.8864042491.

Adding to 1221222112 its reverse (2112221221), we get a palindrome (3333443333).

The spelling of 1221222112 in words is "one billion, two hundred twenty-one million, two hundred twenty-two thousand, one hundred twelve".