320330323311221 has 4 divisors (see below), whose sum is σ = 320331348113772. Its totient is φ = 320329298508672.

The previous prime is 320330323311181. The next prime is 320330323311247. The reversal of 320330323311221 is 122113323033023.

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 171090847228900 + 149239476082321 = 13080170^2 + 12216361^2 .

It is a cyclic number.

It is not a de Polignac number, because 320330323311221 - 2⁶ = 320330323311157 is a prime.

It is a super-2 number, since 2×320330323311221² (a number of 30 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 (320330323311521) 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, 511932266 + ... + 512557611.

It is an arithmetic number, because the mean of its divisors is an integer number (80082837028443).

Almost surely, 2^{320330323311221} is an apocalyptic number.

It is an amenable number.

320330323311221 is a deficient number, since it is larger than the sum of its proper divisors (1024802551).

320330323311221 is a wasteful number, since it uses less digits than its factorization.

320330323311221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1024802550.

The product of its (nonzero) digits is 11664, while the sum is 29.

Adding to 320330323311221 its reverse (122113323033023), we get a palindrome (442443646344244).

The spelling of 320330323311221 in words is "three hundred twenty trillion, three hundred thirty billion, three hundred twenty-three million, three hundred eleven thousand, two hundred twenty-one".