31321122320 has 80 divisors (see below), whose sum is σ = 78412302720. Its totient is φ = 11591596032.

The previous prime is 31321122311. The next prime is 31321122359. The reversal of 31321122320 is 2322112313.

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

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a junction number, because it is equal to n+sod(n) for n = 31321122292 and 31321122301.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 114932 + ... + 275411.

It is an arithmetic number, because the mean of its divisors is an integer number (980153784).

Almost surely, 2^31321122320 is an apocalyptic number.

It is an amenable number.

31321122320 is an abundant number, since it is smaller than the sum of its proper divisors (47091180400).

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

31321122320 is a wasteful number, since it uses less digits than its factorization.

31321122320 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 390432 (or 390426 counting only the distinct ones).

The product of its (nonzero) digits is 432, while the sum is 20.

Adding to 31321122320 its reverse (2322112313), we get a palindrome (33643234633).

The spelling of 31321122320 in words is "thirty-one billion, three hundred twenty-one million, one hundred twenty-two thousand, three hundred twenty".