31121330320 has 40 divisors (see below), whose sum is σ = 72381762360. Its totient is φ = 12444288000.

The previous prime is 31121330299. The next prime is 31121330327. The reversal of 31121330320 is 2303312113.

It can be written as a sum of positive squares in 4 ways, for example, as 50922496 + 31070407824 = 7136^2 + 176268^2 .

It is a tau number, because it is divible by the number of its divisors (40).

It is not an unprimeable number, because it can be changed into a prime (31121330327) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 175266 + ... + 304894.

It is an arithmetic number, because the mean of its divisors is an integer number (1809544059).

Almost surely, 2^31121330320 is an apocalyptic number.

It is an amenable number.

31121330320 is an abundant number, since it is smaller than the sum of its proper divisors (41260432040).

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

31121330320 is a wasteful number, since it uses less digits than its factorization.

31121330320 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 132643 (or 132637 counting only the distinct ones).

The product of its (nonzero) digits is 324, while the sum is 19.

Adding to 31121330320 its reverse (2303312113), we get a palindrome (33424642433).

The spelling of 31121330320 in words is "thirty-one billion, one hundred twenty-one million, three hundred thirty thousand, three hundred twenty".