131231011212 has 72 divisors (see below), whose sum is σ = 379502952192. Its totient is φ = 37455890400.

The previous prime is 131231011181. The next prime is 131231011253. The reversal of 131231011212 is 212110132131.

131231011212 is a `hidden beast` number, since 131 + 2 + 310 + 11 + 212 = 666.

131231011212 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

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

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 23464 + ... + 512847.

It is an arithmetic number, because the mean of its divisors is an integer number (5270874336).

Almost surely, 2^131231011212 is an apocalyptic number.

131231011212 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

131231011212 is an abundant number, since it is smaller than the sum of its proper divisors (248271940980).

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

131231011212 is a wasteful number, since it uses less digits than its factorization.

131231011212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 537299 (or 537294 counting only the distinct ones).

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

Adding to 131231011212 its reverse (212110132131), we get a palindrome (343341143343).

The spelling of 131231011212 in words is "one hundred thirty-one billion, two hundred thirty-one million, eleven thousand, two hundred twelve".