311322032221 has 4 divisors (see below), whose sum is σ = 314231584032. Its totient is φ = 308412480412.

The previous prime is 311322032209. The next prime is 311322032227. The reversal of 311322032221 is 122230223113.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 122230223113 = 31 ⋅3942910423.

It is a cyclic number.

It is not a de Polignac number, because 311322032221 - 2²⁷ = 311187814493 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 311322032192 and 311322032201.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (311322032227) 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, 1454775745 + ... + 1454775958.

It is an arithmetic number, because the mean of its divisors is an integer number (78557896008).

Almost surely, 2^311322032221 is an apocalyptic number.

It is an amenable number.

311322032221 is a deficient number, since it is larger than the sum of its proper divisors (2909551811).

311322032221 is a wasteful number, since it uses less digits than its factorization.

311322032221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2909551810.

The product of its (nonzero) digits is 864, while the sum is 22.

Adding to 311322032221 its reverse (122230223113), we get a palindrome (433552255334).

The spelling of 311322032221 in words is "three hundred eleven billion, three hundred twenty-two million, thirty-two thousand, two hundred twenty-one".