311211211321 has 2 divisors, whose sum is σ = 311211211322. Its totient is φ = 311211211320.

The previous prime is 311211211271. The next prime is 311211211393. The reversal of 311211211321 is 123112112113.

It is a m-pointer prime, because the next prime (311211211393) can be obtained adding 311211211321 to its product of digits (72).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 255545415225 + 55665796096 = 505515^2 + 235936^2 .

It is a cyclic number.

It is not a de Polignac number, because 311211211321 - 2¹¹ = 311211209273 is a prime.

It is not a weakly prime, because it can be changed into another prime (311211211921) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 155605605660 + 155605605661.

It is an arithmetic number, because the mean of its divisors is an integer number (155605605661).

Almost surely, 2^311211211321 is an apocalyptic number.

It is an amenable number.

311211211321 is a deficient number, since it is larger than the sum of its proper divisors (1).

311211211321 is an equidigital number, since it uses as much as digits as its factorization.

311211211321 is an evil number, because the sum of its binary digits is even.

The product of its digits is 72, while the sum is 19.

Adding to 311211211321 its reverse (123112112113), we get a palindrome (434323323434).

The spelling of 311211211321 in words is "three hundred eleven billion, two hundred eleven million, two hundred eleven thousand, three hundred twenty-one".