12111220211 has 4 divisors (see below), whose sum is σ = 12164573832. Its totient is φ = 12057866592.

The previous prime is 12111220181. The next prime is 12111220229. The reversal of 12111220211 is 11202211121.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 11202211121 = 19 ⋅589590059.

It is a cyclic number.

It is not a de Polignac number, because 12111220211 - 2¹⁰ = 12111219187 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12111220241) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 26676470 + ... + 26676923.

It is an arithmetic number, because the mean of its divisors is an integer number (3041143458).

Almost surely, 2^12111220211 is an apocalyptic number.

12111220211 is a deficient number, since it is larger than the sum of its proper divisors (53353621).

12111220211 is an equidigital number, since it uses as much as digits as its factorization.

12111220211 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 53353620.

The product of its (nonzero) digits is 16, while the sum is 14.

Adding to 12111220211 its reverse (11202211121), we get a palindrome (23313431332).

The spelling of 12111220211 in words is "twelve billion, one hundred eleven million, two hundred twenty thousand, two hundred eleven".