311330322221 has 4 divisors (see below), whose sum is σ = 319744655292. Its totient is φ = 302915989152.

The previous prime is 311330322181. The next prime is 311330322229. The reversal of 311330322221 is 122223033113.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 122223033113 = 44893 ⋅2722541.

It can be written as a sum of positive squares in 2 ways, for example, as 258033520900 + 53296801321 = 507970^2 + 230861^2 .

It is a cyclic number.

It is not a de Polignac number, because 311330322221 - 2⁶ = 311330322157 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (311330322229) 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, 4207166480 + ... + 4207166553.

It is an arithmetic number, because the mean of its divisors is an integer number (79936163823).

Almost surely, 2^311330322221 is an apocalyptic number.

It is an amenable number.

311330322221 is a deficient number, since it is larger than the sum of its proper divisors (8414333071).

311330322221 is an equidigital number, since it uses as much as digits as its factorization.

311330322221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8414333070.

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

Adding to 311330322221 its reverse (122223033113), we get a palindrome (433553355334).

The spelling of 311330322221 in words is "three hundred eleven billion, three hundred thirty million, three hundred twenty-two thousand, two hundred twenty-one".