12111221111211 has 12 divisors (see below), whose sum is σ = 17966796483792. Its totient is φ = 7855927207056.

The previous prime is 12111221111189. The next prime is 12111221111257. The reversal of 12111221111211 is 11211112211121.

12111221111211 is a `hidden beast` number, since 12 + 111 + 221 + 111 + 211 = 666.

It is not a de Polignac number, because 12111221111211 - 2¹⁵ = 12111221078443 is a prime.

It is not an unprimeable number, because it can be changed into a prime (12111221111111) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 18185016351 + ... + 18185017016.

It is an arithmetic number, because the mean of its divisors is an integer number (1497233040316).

Almost surely, 2^{12111221111211} is an apocalyptic number.

12111221111211 is a deficient number, since it is larger than the sum of its proper divisors (5855575372581).

12111221111211 is a wasteful number, since it uses less digits than its factorization.

12111221111211 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36370033410 (or 36370033407 counting only the distinct ones).

The product of its digits is 16, while the sum is 18.

Adding to 12111221111211 its reverse (11211112211121), we get a palindrome (23322333322332).

The spelling of 12111221111211 in words is "twelve trillion, one hundred eleven billion, two hundred twenty-one million, one hundred eleven thousand, two hundred eleven".