320140321 has 2 divisors, whose sum is σ = 320140322. Its totient is φ = 320140320.

The previous prime is 320140319. The next prime is 320140333. The reversal of 320140321 is 123041023.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 262926225 + 57214096 = 16215^2 + 7564^2 .

It is a cyclic number.

It is not a de Polignac number, because 320140321 - 2¹ = 320140319 is a prime.

It is a super-3 number, since 3×320140321³ (a number of 26 digits) contains 333 as substring.

Together with 320140319, it forms a pair of twin primes.

It is a junction number, because it is equal to n+sod(n) for n = 320140295 and 320140304.

It is not a weakly prime, because it can be changed into another prime (320140621) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 160070160 + 160070161.

It is an arithmetic number, because the mean of its divisors is an integer number (160070161).

Almost surely, 2^320140321 is an apocalyptic number.

It is an amenable number.

320140321 is a deficient number, since it is larger than the sum of its proper divisors (1).

320140321 is an equidigital number, since it uses as much as digits as its factorization.

320140321 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 144, while the sum is 16.

The square root of 320140321 is about 17892.4654813136. The cubic root of 320140321 is about 684.0903413670.

Adding to 320140321 its reverse (123041023), we get a palindrome (443181344).

The spelling of 320140321 in words is "three hundred twenty million, one hundred forty thousand, three hundred twenty-one".