12011023231211 has 4 divisors (see below), whose sum is σ = 12533241632592. Its totient is φ = 11488804829832.

The previous prime is 12011023231159. The next prime is 12011023231213. The reversal of 12011023231211 is 11213232011021.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-12011023231211 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12011023231213) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 261109200656 + ... + 261109200701.

It is an arithmetic number, because the mean of its divisors is an integer number (3133310408148).

Almost surely, 2^{12011023231211} is an apocalyptic number.

12011023231211 is a deficient number, since it is larger than the sum of its proper divisors (522218401381).

12011023231211 is an equidigital number, since it uses as much as digits as its factorization.

12011023231211 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 522218401380.

The product of its (nonzero) digits is 144, while the sum is 20.

Adding to 12011023231211 its reverse (11213232011021), we get a palindrome (23224255242232).

The spelling of 12011023231211 in words is "twelve trillion, eleven billion, twenty-three million, two hundred thirty-one thousand, two hundred eleven".