231311131212 has 24 divisors (see below), whose sum is σ = 616829683456. Its totient is φ = 66088894608.

The previous prime is 231311131153. The next prime is 231311131223. The reversal of 231311131212 is 212131113132.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a nude number because it is divisible by every one of its digits.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1376851888 + ... + 1376852055.

Almost surely, 2^231311131212 is an apocalyptic number.

It is an amenable number.

231311131212 is an abundant number, since it is smaller than the sum of its proper divisors (385518552244).

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

231311131212 is a wasteful number, since it uses less digits than its factorization.

231311131212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2753703957 (or 2753703955 counting only the distinct ones).

The product of its digits is 216, while the sum is 21.

Adding to 231311131212 its reverse (212131113132), we get a palindrome (443442244344).

The spelling of 231311131212 in words is "two hundred thirty-one billion, three hundred eleven million, one hundred thirty-one thousand, two hundred twelve".