311122302221 has 4 divisors (see below), whose sum is σ = 321850657500. Its totient is φ = 300393946944.

The previous prime is 311122302203. The next prime is 311122302229. The reversal of 311122302221 is 122203221113.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 122203221113 = 276251 ⋅442363.

It can be written as a sum of positive squares in 2 ways, for example, as 123208722121 + 187913580100 = 351011^2 + 433490^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-311122302221 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 311122302193 and 311122302202.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (311122302229) 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, 5364177596 + ... + 5364177653.

It is an arithmetic number, because the mean of its divisors is an integer number (80462664375).

Almost surely, 2^311122302221 is an apocalyptic number.

It is an amenable number.

311122302221 is a deficient number, since it is larger than the sum of its proper divisors (10728355279).

311122302221 is a wasteful number, since it uses less digits than its factorization.

311122302221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10728355278.

The product of its (nonzero) digits is 288, while the sum is 20.

Adding to 311122302221 its reverse (122203221113), we get a palindrome (433325523334).

The spelling of 311122302221 in words is "three hundred eleven billion, one hundred twenty-two million, three hundred two thousand, two hundred twenty-one".