1221113044 has 12 divisors (see below), whose sum is σ = 2137676800. Its totient is φ = 610348248.

The previous prime is 1221113041. The next prime is 1221113081. The reversal of 1221113044 is 4403111221.

It is a super-2 number, since 2×1221113044² = 2982234132453891872, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1221113041) 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, 38484 + ... + 62635.

Almost surely, 2^1221113044 is an apocalyptic number.

It is an amenable number.

1221113044 is a deficient number, since it is larger than the sum of its proper divisors (916563756).

1221113044 is a wasteful number, since it uses less digits than its factorization.

1221113044 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 104142 (or 104140 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 19.

The square root of 1221113044 is about 34944.4279392295. The cubic root of 1221113044 is about 1068.8545823629.

Adding to 1221113044 its reverse (4403111221), we get a palindrome (5624224265).

The spelling of 1221113044 in words is "one billion, two hundred twenty-one million, one hundred thirteen thousand, forty-four".