12031211312 has 40 divisors (see below), whose sum is σ = 25604194560. Its totient is φ = 5451209280.

The previous prime is 12031211281. The next prime is 12031211329. The reversal of 12031211312 is 21311213021.

It is a super-2 number, since 2×12031211312² (a number of 21 digits) contains 22 as substring.

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, 853364 + ... + 867347.

It is an arithmetic number, because the mean of its divisors is an integer number (640104864).

Almost surely, 2^12031211312 is an apocalyptic number.

It is an amenable number.

12031211312 is an abundant number, since it is smaller than the sum of its proper divisors (13572983248).

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

12031211312 is a wasteful number, since it uses less digits than its factorization.

12031211312 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1720761 (or 1720755 counting only the distinct ones).

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

Adding to 12031211312 its reverse (21311213021), we get a palindrome (33342424333).

The spelling of 12031211312 in words is "twelve billion, thirty-one million, two hundred eleven thousand, three hundred twelve".