320023231221 has 16 divisors (see below), whose sum is σ = 449323409600. Its totient is φ = 202044336768.

The previous prime is 320023231181. The next prime is 320023231249. The reversal of 320023231221 is 122132320023.

It is a happy number.

It is not a de Polignac number, because 320023231221 - 2⁷ = 320023231093 is a prime.

It is a super-2 number, since 2×320023231221² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (320023251221) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 896056 + ... + 1201233.

It is an arithmetic number, because the mean of its divisors is an integer number (28082713100).

Almost surely, 2^320023231221 is an apocalyptic number.

It is an amenable number.

320023231221 is a deficient number, since it is larger than the sum of its proper divisors (129300178379).

320023231221 is a wasteful number, since it uses less digits than its factorization.

320023231221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2099988.

The product of its (nonzero) digits is 864, while the sum is 21.

Adding to 320023231221 its reverse (122132320023), we get a palindrome (442155551244).

The spelling of 320023231221 in words is "three hundred twenty billion, twenty-three million, two hundred thirty-one thousand, two hundred twenty-one".