31213110320 has 80 divisors (see below), whose sum is σ = 87302864640. Its totient is φ = 10138390272.

The previous prime is 31213110317. The next prime is 31213110367. The reversal of 31213110320 is 2301131213.

It is a tau number, because it is divible by the number of its divisors (80).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1456142 + ... + 1477421.

It is an arithmetic number, because the mean of its divisors is an integer number (1091285808).

Almost surely, 2^31213110320 is an apocalyptic number.

It is an amenable number.

31213110320 is an abundant number, since it is smaller than the sum of its proper divisors (56089754320).

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

31213110320 is a wasteful number, since it uses less digits than its factorization.

31213110320 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2933602 (or 2933596 counting only the distinct ones).

The product of its (nonzero) digits is 108, while the sum is 17.

Adding to 31213110320 its reverse (2301131213), we get a palindrome (33514241533).

The spelling of 31213110320 in words is "thirty-one billion, two hundred thirteen million, one hundred ten thousand, three hundred twenty".