320321131321 has 2 divisors, whose sum is σ = 320321131322. Its totient is φ = 320321131320.

The previous prime is 320321131187. The next prime is 320321131327. The reversal of 320321131321 is 123131123023.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 281922769296 + 38398362025 = 530964^2 + 195955^2 .

It is a cyclic number.

It is not a de Polignac number, because 320321131321 - 2⁹ = 320321130809 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 320321131292 and 320321131301.

It is not a weakly prime, because it can be changed into another prime (320321131327) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 160160565660 + 160160565661.

It is an arithmetic number, because the mean of its divisors is an integer number (160160565661).

Almost surely, 2^320321131321 is an apocalyptic number.

It is an amenable number.

320321131321 is a deficient number, since it is larger than the sum of its proper divisors (1).

320321131321 is an equidigital number, since it uses as much as digits as its factorization.

320321131321 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 648, while the sum is 22.

Adding to 320321131321 its reverse (123131123023), we get a palindrome (443452254344).

The spelling of 320321131321 in words is "three hundred twenty billion, three hundred twenty-one million, one hundred thirty-one thousand, three hundred twenty-one".