1221112044 has 48 divisors (see below), whose sum is σ = 3303498240. Its totient is φ = 389339280.

The previous prime is 1221112003. The next prime is 1221112069. The reversal of 1221112044 is 4402111221.

It is a super-2 number, since 2×1221112044² = 2982229248003715872, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 243312 + ... + 248279.

It is an arithmetic number, because the mean of its divisors is an integer number (68822880).

Almost surely, 2^1221112044 is an apocalyptic number.

It is an amenable number.

1221112044 is an abundant number, since it is smaller than the sum of its proper divisors (2082386196).

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

1221112044 is a wasteful number, since it uses less digits than its factorization.

1221112044 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 491627 (or 491619 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 18.

The square root of 1221112044 is about 34944.4136307937. The cubic root of 1221112044 is about 1068.8542905923.

Adding to 1221112044 its reverse (4402111221), we get a palindrome (5623223265).

The spelling of 1221112044 in words is "one billion, two hundred twenty-one million, one hundred twelve thousand, forty-four".