320243321 has 4 divisors (see below), whose sum is σ = 320283252. Its totient is φ = 320203392.

The previous prime is 320243311. The next prime is 320243369. The reversal of 320243321 is 123342023.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 140683321 + 179560000 = 11861^2 + 13400^2 .

It is a cyclic number.

It is not a de Polignac number, because 320243321 - 2⁶ = 320243257 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 320243293 and 320243302.

It is not an unprimeable number, because it can be changed into a prime (320243311) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3296 + ... + 25521.

It is an arithmetic number, because the mean of its divisors is an integer number (80070813).

Almost surely, 2^320243321 is an apocalyptic number.

It is an amenable number.

320243321 is a deficient number, since it is larger than the sum of its proper divisors (39931).

320243321 is a wasteful number, since it uses less digits than its factorization.

320243321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 39930.

The product of its (nonzero) digits is 864, while the sum is 20.

The square root of 320243321 is about 17895.3435563557. The cubic root of 320243321 is about 684.1636985224.

Adding to 320243321 its reverse (123342023), we get a palindrome (443585344).

The spelling of 320243321 in words is "three hundred twenty million, two hundred forty-three thousand, three hundred twenty-one".