31320213312 has 28 divisors (see below), whose sum is σ = 82868064896. Its totient is φ = 10440071040.

The previous prime is 31320213209. The next prime is 31320213317. The reversal of 31320213312 is 21331202313.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31320213317) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 81562864 + ... + 81563247.

Almost surely, 2^31320213312 is an apocalyptic number.

31320213312 is a gapful number since it is divisible by the number (32) formed by its first and last digit.

It is an amenable number.

31320213312 is an abundant number, since it is smaller than the sum of its proper divisors (51547851584).

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

31320213312 is a wasteful number, since it uses less digits than its factorization.

31320213312 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 163126126 (or 163126116 counting only the distinct ones).

The product of its (nonzero) digits is 648, while the sum is 21.

Adding to 31320213312 its reverse (21331202313), we get a palindrome (52651415625).

The spelling of 31320213312 in words is "thirty-one billion, three hundred twenty million, two hundred thirteen thousand, three hundred twelve".