311441213221 has 2 divisors, whose sum is σ = 311441213222. Its totient is φ = 311441213220.

The previous prime is 311441213207. The next prime is 311441213267. The reversal of 311441213221 is 122312144113.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 298814196321 + 12627016900 = 546639^2 + 112370^2 .

It is an emirp because it is prime and its reverse (122312144113) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 311441213221 - 2⁵ = 311441213189 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (311441213621) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 155720606610 + 155720606611.

It is an arithmetic number, because the mean of its divisors is an integer number (155720606611).

Almost surely, 2^311441213221 is an apocalyptic number.

It is an amenable number.

311441213221 is a deficient number, since it is larger than the sum of its proper divisors (1).

311441213221 is an equidigital number, since it uses as much as digits as its factorization.

311441213221 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1152, while the sum is 25.

Adding to 311441213221 its reverse (122312144113), we get a palindrome (433753357334).

The spelling of 311441213221 in words is "three hundred eleven billion, four hundred forty-one million, two hundred thirteen thousand, two hundred twenty-one".