311220121022413 has 2 divisors, whose sum is σ = 311220121022414. Its totient is φ = 311220121022412.

The previous prime is 311220121022339. The next prime is 311220121022431. The reversal of 311220121022413 is 314220121022113.

Together with next prime (311220121022431) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 279865530389124 + 31354590633289 = 16729182^2 + 5599517^2 .

It is a cyclic number.

It is not a de Polignac number, because 311220121022413 - 2¹⁷ = 311220120891341 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (311220121022453) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 155610060511206 + 155610060511207.

It is an arithmetic number, because the mean of its divisors is an integer number (155610060511207).

Almost surely, 2^{311220121022413} is an apocalyptic number.

It is an amenable number.

311220121022413 is a deficient number, since it is larger than the sum of its proper divisors (1).

311220121022413 is an equidigital number, since it uses as much as digits as its factorization.

311220121022413 is an odious number, because the sum of its binary digits is odd.

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

Adding to 311220121022413 its reverse (314220121022113), we get a palindrome (625440242044526).

The spelling of 311220121022413 in words is "three hundred eleven trillion, two hundred twenty billion, one hundred twenty-one million, twenty-two thousand, four hundred thirteen".