320023221 has 16 divisors (see below), whose sum is σ = 488114304. Its totient is φ = 182697984.

The previous prime is 320023217. The next prime is 320023307. The reversal of 320023221 is 122320023.

It is not a de Polignac number, because 320023221 - 2² = 320023217 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 320023221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (320023721) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 17605 + ... + 30821.

It is an arithmetic number, because the mean of its divisors is an integer number (30507144).

Almost surely, 2^320023221 is an apocalyptic number.

It is an amenable number.

320023221 is a deficient number, since it is larger than the sum of its proper divisors (168091083).

320023221 is a wasteful number, since it uses less digits than its factorization.

320023221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14380.

The product of its (nonzero) digits is 144, while the sum is 15.

The square root of 320023221 is about 17889.1928549054. The cubic root of 320023221 is about 684.0069230003.

Adding to 320023221 its reverse (122320023), we get a palindrome (442343244).

The spelling of 320023221 in words is "three hundred twenty million, twenty-three thousand, two hundred twenty-one".