1221231112 has 24 divisors (see below), whose sum is σ = 2366070750. Its totient is φ = 590914560.

The previous prime is 1221231107. The next prime is 1221231113. The reversal of 1221231112 is 2111321221.

It can be written as a sum of positive squares in only one way, i.e., 1218428836 + 2802276 = 34906^2 + 1674^2 .

It is not an unprimeable number, because it can be changed into a prime (1221231113) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 71737 + ... + 87112.

Almost surely, 2^1221231112 is an apocalyptic number.

It is an amenable number.

1221231112 is a deficient number, since it is larger than the sum of its proper divisors (1144839638).

1221231112 is a wasteful number, since it uses less digits than its factorization.

1221231112 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 158917 (or 158882 counting only the distinct ones).

The product of its digits is 48, while the sum is 16.

The square root of 1221231112 is about 34946.1172664432. The cubic root of 1221231112 is about 1068.8890300215.

Adding to 1221231112 its reverse (2111321221), we get a palindrome (3332552333).

The spelling of 1221231112 in words is "one billion, two hundred twenty-one million, two hundred thirty-one thousand, one hundred twelve".