31211220233312 has 48 divisors (see below), whose sum is σ = 71415503953920. Its totient is φ = 13149521351808.

The previous prime is 31211220233311. The next prime is 31211220233377. The reversal of 31211220233312 is 21333202211213.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31211220233311) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1180798688 + ... + 1180825119.

It is an arithmetic number, because the mean of its divisors is an integer number (1487822999040).

Almost surely, 2^{31211220233312} is an apocalyptic number.

31211220233312 is a gapful number since it is divisible by the number (32) formed by its first and last digit.

It is an amenable number.

31211220233312 is an abundant number, since it is smaller than the sum of its proper divisors (40204283720608).

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

31211220233312 is a wasteful number, since it uses less digits than its factorization.

31211220233312 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2361623883 (or 2361623875 counting only the distinct ones).

The product of its (nonzero) digits is 2592, while the sum is 26.

Adding to 31211220233312 its reverse (21333202211213), we get a palindrome (52544422444525).

The spelling of 31211220233312 in words is "thirty-one trillion, two hundred eleven billion, two hundred twenty million, two hundred thirty-three thousand, three hundred twelve".