12011212311233 has 4 divisors (see below), whose sum is σ = 12011221854660. Its totient is φ = 12011202767808.

The previous prime is 12011212311227. The next prime is 12011212311283. The reversal of 12011212311233 is 33211321211021.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 8237548632769 + 3773663678464 = 2870113^2 + 1942592^2 .

It is a cyclic number.

It is not a de Polignac number, because 12011212311233 - 2¹² = 12011212307137 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 12011212311199 and 12011212311208.

It is not an unprimeable number, because it can be changed into a prime (12011212311283) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2534060 + ... + 5517597.

It is an arithmetic number, because the mean of its divisors is an integer number (3002805463665).

Almost surely, 2^{12011212311233} is an apocalyptic number.

It is an amenable number.

12011212311233 is a deficient number, since it is larger than the sum of its proper divisors (9543427).

12011212311233 is an equidigital number, since it uses as much as digits as its factorization.

12011212311233 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9543426.

The product of its (nonzero) digits is 432, while the sum is 23.

Adding to 12011212311233 its reverse (33211321211021), we get a palindrome (45222533522254).

The spelling of 12011212311233 in words is "twelve trillion, eleven billion, two hundred twelve million, three hundred eleven thousand, two hundred thirty-three".