113131212012 has 72 divisors (see below), whose sum is σ = 351963780896. Its totient is φ = 29836802304.

The previous prime is 113131211959. The next prime is 113131212067. The reversal of 113131212012 is 210212131311.

It is a super-2 number, since 2×113131212012² (a number of 23 digits) 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 (19) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 17263393 + ... + 17269944.

Almost surely, 2^113131212012 is an apocalyptic number.

113131212012 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

113131212012 is an abundant number, since it is smaller than the sum of its proper divisors (238832568884).

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

113131212012 is a wasteful number, since it uses less digits than its factorization.

113131212012 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 34533367 (or 34533362 counting only the distinct ones).

The product of its (nonzero) digits is 72, while the sum is 18.

Adding to 113131212012 its reverse (210212131311), we get a palindrome (323343343323).

The spelling of 113131212012 in words is "one hundred thirteen billion, one hundred thirty-one million, two hundred twelve thousand, twelve".