1231213112 has 16 divisors (see below), whose sum is σ = 2382993600. Its totient is φ = 595748160.

The previous prime is 1231213103. The next prime is 1231213127. The reversal of 1231213112 is 2113121321.

It is a congruent number.

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 3 ways as a sum of consecutive naturals, for example, 2482037 + ... + 2482532.

It is an arithmetic number, because the mean of its divisors is an integer number (148937100).

Almost surely, 2^1231213112 is an apocalyptic number.

It is an amenable number.

1231213112 is a deficient number, since it is larger than the sum of its proper divisors (1151780488).

1231213112 is a wasteful number, since it uses less digits than its factorization.

1231213112 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4964606 (or 4964602 counting only the distinct ones).

The product of its digits is 72, while the sum is 17.

The square root of 1231213112 is about 35088.6464828725. The cubic root of 1231213112 is about 1071.7933973831.

Adding to 1231213112 its reverse (2113121321), we get a palindrome (3344334433).

The spelling of 1231213112 in words is "one billion, two hundred thirty-one million, two hundred thirteen thousand, one hundred twelve".