320331231221 has 4 divisors (see below), whose sum is σ = 320538031500. Its totient is φ = 320124430944.

The previous prime is 320331231211. The next prime is 320331231263. The reversal of 320331231221 is 122132133023.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 120852874321 + 199478356900 = 347639^2 + 446630^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-320331231221 is a prime.

It is a super-2 number, since 2×320331231221² (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 (320331231211) 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 3 ways as a sum of consecutive naturals, for example, 103397816 + ... + 103400913.

It is an arithmetic number, because the mean of its divisors is an integer number (80134507875).

Almost surely, 2^320331231221 is an apocalyptic number.

It is an amenable number.

320331231221 is a deficient number, since it is larger than the sum of its proper divisors (206800279).

320331231221 is a wasteful number, since it uses less digits than its factorization.

320331231221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 206800278.

The product of its (nonzero) digits is 1296, while the sum is 23.

Adding to 320331231221 its reverse (122132133023), we get a palindrome (442463364244).

The spelling of 320331231221 in words is "three hundred twenty billion, three hundred thirty-one million, two hundred thirty-one thousand, two hundred twenty-one".