320311021 has 2 divisors, whose sum is σ = 320311022. Its totient is φ = 320311020.

The previous prime is 320311001. The next prime is 320311031. The reversal of 320311021 is 120113023.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 205606921 + 114704100 = 14339^2 + 10710^2 .

It is a cyclic number.

It is not a de Polignac number, because 320311021 - 2⁵ = 320310989 is a prime.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 320310992 and 320311010.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (320311001) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 160155510 + 160155511.

It is an arithmetic number, because the mean of its divisors is an integer number (160155511).

Almost surely, 2^320311021 is an apocalyptic number.

It is an amenable number.

320311021 is a deficient number, since it is larger than the sum of its proper divisors (1).

320311021 is an equidigital number, since it uses as much as digits as its factorization.

320311021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 36, while the sum is 13.

The square root of 320311021 is about 17897.2350099114. The cubic root of 320311021 is about 684.2119062610.

Adding to 320311021 its reverse (120113023), we get a palindrome (440424044).

The spelling of 320311021 in words is "three hundred twenty million, three hundred eleven thousand, twenty-one".