311200122221 has 2 divisors, whose sum is σ = 311200122222. Its totient is φ = 311200122220.

The previous prime is 311200122217. The next prime is 311200122227. The reversal of 311200122221 is 122221002113.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 232512018025 + 78688104196 = 482195^2 + 280514^2 .

It is a cyclic number.

It is not a de Polignac number, because 311200122221 - 2² = 311200122217 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 311200122221.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (311200122227) 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, 155600061110 + 155600061111.

It is an arithmetic number, because the mean of its divisors is an integer number (155600061111).

Almost surely, 2^311200122221 is an apocalyptic number.

It is an amenable number.

311200122221 is a deficient number, since it is larger than the sum of its proper divisors (1).

311200122221 is an equidigital number, since it uses as much as digits as its factorization.

311200122221 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 96, while the sum is 17.

Adding to 311200122221 its reverse (122221002113), we get a palindrome (433421124334).

The spelling of 311200122221 in words is "three hundred eleven billion, two hundred million, one hundred twenty-two thousand, two hundred twenty-one".