311223022021 has 2 divisors, whose sum is σ = 311223022022. Its totient is φ = 311223022020.

The previous prime is 311223021953. The next prime is 311223022031. The reversal of 311223022021 is 120220322113.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 234100177921 + 77122844100 = 483839^2 + 277710^2 .

It is a cyclic number.

It is not a de Polignac number, because 311223022021 - 2¹⁷ = 311222890949 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 311223022021.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (311223022031) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 155611511010 + 155611511011.

It is an arithmetic number, because the mean of its divisors is an integer number (155611511011).

Almost surely, 2^311223022021 is an apocalyptic number.

It is an amenable number.

311223022021 is a deficient number, since it is larger than the sum of its proper divisors (1).

311223022021 is an equidigital number, since it uses as much as digits as its factorization.

311223022021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 288, while the sum is 19.

Adding to 311223022021 its reverse (120220322113), we get a palindrome (431443344134).

The spelling of 311223022021 in words is "three hundred eleven billion, two hundred twenty-three million, twenty-two thousand, twenty-one".