320323021 has 4 divisors (see below), whose sum is σ = 323157852. Its totient is φ = 317488192.

The previous prime is 320323013. The next prime is 320323063. The reversal of 320323021 is 120323023.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 120323023 = 2213 ⋅54371.

It can be written as a sum of positive squares in 2 ways, for example, as 31696900 + 288626121 = 5630^2 + 16989^2 .

It is a cyclic number.

It is not a de Polignac number, because 320323021 - 2³ = 320323013 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 320322986 and 320323004.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (320323321) 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, 1417246 + ... + 1417471.

It is an arithmetic number, because the mean of its divisors is an integer number (80789463).

Almost surely, 2^320323021 is an apocalyptic number.

It is an amenable number.

320323021 is a deficient number, since it is larger than the sum of its proper divisors (2834831).

320323021 is a wasteful number, since it uses less digits than its factorization.

320323021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2834830.

The product of its (nonzero) digits is 216, while the sum is 16.

The square root of 320323021 is about 17897.5702540876. The cubic root of 320323021 is about 684.2204504985.

Adding to 320323021 its reverse (120323023), we get a palindrome (440646044).

It can be divided in two parts, 32032 and 3021, that added together give a palindrome (35053).

The spelling of 320323021 in words is "three hundred twenty million, three hundred twenty-three thousand, twenty-one".