12011111221211 has 2 divisors, whose sum is σ = 12011111221212. Its totient is φ = 12011111221210.

The previous prime is 12011111221199. The next prime is 12011111221217. The reversal of 12011111221211 is 11212211111021.

12011111221211 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 12011111221211 - 2⁶ = 12011111221147 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 12011111221211.

It is not a weakly prime, because it can be changed into another prime (12011111221217) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6005555610605 + 6005555610606.

It is an arithmetic number, because the mean of its divisors is an integer number (6005555610606).

Almost surely, 2^{12011111221211} is an apocalyptic number.

12011111221211 is a deficient number, since it is larger than the sum of its proper divisors (1).

12011111221211 is an equidigital number, since it uses as much as digits as its factorization.

12011111221211 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 16, while the sum is 17.

Adding to 12011111221211 its reverse (11212211111021), we get a palindrome (23223322332232).

The spelling of 12011111221211 in words is "twelve trillion, eleven billion, one hundred eleven million, two hundred twenty-one thousand, two hundred eleven".