31220433312 has 96 divisors (see below), whose sum is σ = 88275640320. Its totient is φ = 9633212160.

The previous prime is 31220433311. The next prime is 31220433331. The reversal of 31220433312 is 21333402213.

It is a tau number, because it is divible by the number of its divisors (96).

It is a Harshad number since it is a multiple of its sum of digits (24).

It is not an unprimeable number, because it can be changed into a prime (31220433311) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 159612 + ... + 296507.

It is an arithmetic number, because the mean of its divisors is an integer number (919537920).

Almost surely, 2^31220433312 is an apocalyptic number.

31220433312 is a gapful number since it is divisible by the number (32) formed by its first and last digit.

It is an amenable number.

31220433312 is an abundant number, since it is smaller than the sum of its proper divisors (57055207008).

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

31220433312 is a wasteful number, since it uses less digits than its factorization.

31220433312 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 456186 (or 456178 counting only the distinct ones).

The product of its (nonzero) digits is 2592, while the sum is 24.

Adding to 31220433312 its reverse (21333402213), we get a palindrome (52553835525).

The spelling of 31220433312 in words is "thirty-one billion, two hundred twenty million, four hundred thirty-three thousand, three hundred twelve".