13231212012 has 18 divisors (see below), whose sum is σ = 33445563788. Its totient is φ = 4410403992.

The previous prime is 13231211971. The next prime is 13231212017. The reversal of 13231212012 is 21021213231.

It is a tau number, because it is divible by the number of its divisors (18).

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

It is not an unprimeable number, because it can be changed into a prime (13231212017) 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, 183766798 + ... + 183766869.

Almost surely, 2^13231212012 is an apocalyptic number.

13231212012 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

13231212012 is an abundant number, since it is smaller than the sum of its proper divisors (20214351776).

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

13231212012 is a wasteful number, since it uses less digits than its factorization.

13231212012 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 367533677 (or 367533672 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 18.

Adding to 13231212012 its reverse (21021213231), we get a palindrome (34252425243).

The spelling of 13231212012 in words is "thirteen billion, two hundred thirty-one million, two hundred twelve thousand, twelve".