320131321 has 12 divisors (see below), whose sum is σ = 330492076. Its totient is φ = 310078080.

The previous prime is 320131307. The next prime is 320131333. The reversal of 320131321 is 123131023.

It can be written as a sum of positive squares in 6 ways, for example, as 215355625 + 104775696 = 14675^2 + 10236^2 .

It is not a de Polignac number, because 320131321 - 2⁹ = 320130809 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 320131295 and 320131304.

It is not an unprimeable number, because it can be changed into a prime (320131391) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 263311 + ... + 264523.

Almost surely, 2^320131321 is an apocalyptic number.

It is an amenable number.

320131321 is a deficient number, since it is larger than the sum of its proper divisors (10360755).

320131321 is a wasteful number, since it uses less digits than its factorization.

320131321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1452 (or 1411 counting only the distinct ones).

The product of its (nonzero) digits is 108, while the sum is 16.

The square root of 320131321 is about 17892.2139770348. The cubic root of 320131321 is about 684.0839307710.

Adding to 320131321 its reverse (123131023), we get a palindrome (443262344).

The spelling of 320131321 in words is "three hundred twenty million, one hundred thirty-one thousand, three hundred twenty-one".