31323221320 has 32 divisors (see below), whose sum is σ = 72907500600. Its totient is φ = 12097243648.

The previous prime is 31323221317. The next prime is 31323221333. The reversal of 31323221320 is 2312232313.

It can be written as a sum of positive squares in 4 ways, for example, as 25400071876 + 5923149444 = 159374^2 + 76962^2 .

It is a super-2 number, since 2×31323221320² (a number of 22 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 31323221291 and 31323221300.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 13500229 + ... + 13502548.

Almost surely, 2^31323221320 is an apocalyptic number.

It is an amenable number.

31323221320 is an abundant number, since it is smaller than the sum of its proper divisors (41584279280).

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

31323221320 is a wasteful number, since it uses less digits than its factorization.

31323221320 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27002817 (or 27002813 counting only the distinct ones).

The product of its (nonzero) digits is 1296, while the sum is 22.

Adding to 31323221320 its reverse (2312232313), we get a palindrome (33635453633).

The spelling of 31323221320 in words is "thirty-one billion, three hundred twenty-three million, two hundred twenty-one thousand, three hundred twenty".