311322000221 has 2 divisors, whose sum is σ = 311322000222. Its totient is φ = 311322000220.

The previous prime is 311322000211. The next prime is 311322000247. The reversal of 311322000221 is 122000223113.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 185907568900 + 125414431321 = 431170^2 + 354139^2 .

It is a cyclic number.

It is not a de Polignac number, because 311322000221 - 2¹⁴ = 311321983837 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 311322000221.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (311322000211) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 155661000110 + 155661000111.

It is an arithmetic number, because the mean of its divisors is an integer number (155661000111).

Almost surely, 2^311322000221 is an apocalyptic number.

It is an amenable number.

311322000221 is a deficient number, since it is larger than the sum of its proper divisors (1).

311322000221 is an equidigital number, since it uses as much as digits as its factorization.

311322000221 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 144, while the sum is 17.

Adding to 311322000221 its reverse (122000223113), we get a palindrome (433322223334).

The spelling of 311322000221 in words is "three hundred eleven billion, three hundred twenty-two million, two hundred twenty-one", and thus it is an aban number.