12311220212789 has 2 divisors, whose sum is σ = 12311220212790. Its totient is φ = 12311220212788.

The previous prime is 12311220212783. The next prime is 12311220212801. The reversal of 12311220212789 is 98721202211321.

12311220212789 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 10173899019025 + 2137321193764 = 3189655^2 + 1461958^2 .

It is an emirp because it is prime and its reverse (98721202211321) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-12311220212789 is a prime.

It is a super-2 number, since 2×12311220212789² (a number of 27 digits) contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12311220212783) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6155610106394 + 6155610106395.

It is an arithmetic number, because the mean of its divisors is an integer number (6155610106395).

Almost surely, 2^{12311220212789} is an apocalyptic number.

It is an amenable number.

12311220212789 is a deficient number, since it is larger than the sum of its proper divisors (1).

12311220212789 is an equidigital number, since it uses as much as digits as its factorization.

12311220212789 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 48384, while the sum is 41.

The spelling of 12311220212789 in words is "twelve trillion, three hundred eleven billion, two hundred twenty million, two hundred twelve thousand, seven hundred eighty-nine".