12111111220211 has 32 divisors (see below), whose sum is σ = 12589922016000. Its totient is φ = 11644042861440.

The previous prime is 12111111220177. The next prime is 12111111220217. The reversal of 12111111220211 is 11202211111121.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-12111111220211 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 12111111220211.

It is not an unprimeable number, because it can be changed into a prime (12111111220217) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1961945921 + ... + 1961952093.

It is an arithmetic number, because the mean of its divisors is an integer number (393435063000).

Almost surely, 2^{12111111220211} is an apocalyptic number.

12111111220211 is a deficient number, since it is larger than the sum of its proper divisors (478810795789).

12111111220211 is a wasteful number, since it uses less digits than its factorization.

12111111220211 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9779.

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

Adding to 12111111220211 its reverse (11202211111121), we get a palindrome (23313322331332).

The spelling of 12111111220211 in words is "twelve trillion, one hundred eleven billion, one hundred eleven million, two hundred twenty thousand, two hundred eleven".