1221122112 has 56 divisors (see below), whose sum is σ = 3692444736. Its totient is φ = 348891648.

The previous prime is 1221122099. The next prime is 1221122159. The reversal of 1221122112 is 2112211221.

It is a tau number, because it is divible by the number of its divisors (56).

It is a super-2 number, since 2×1221122112² = 2982278424830681088, which contains 22 as substring.

It is a nude number because it is divisible by every one of its digits and also a Zuckerman number because it is divisible by the product of its digits.

It is a junction number, because it is equal to n+sod(n) for n = 1221122091 and 1221122100.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 452943 + ... + 455630.

Almost surely, 2^1221122112 is an apocalyptic number.

1221122112 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

1221122112 is an abundant number, since it is smaller than the sum of its proper divisors (2471322624).

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

1221122112 is an equidigital number, since it uses as much as digits as its factorization.

1221122112 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 908595 (or 908585 counting only the distinct ones).

The product of its digits is 32, while the sum is 15.

The square root of 1221122112 is about 34944.5576878575. The cubic root of 1221122112 is about 1068.8572281320.

Adding to 1221122112 its reverse (2112211221), we get a palindrome (3333333333).

The spelling of 1221122112 in words is "one billion, two hundred twenty-one million, one hundred twenty-two thousand, one hundred twelve".