12111211 has 16 divisors (see below), whose sum is σ = 14215104. Its totient is φ = 10105344.

The previous prime is 12111199. The next prime is 12111217. The reversal of 12111211 is 11211121.

It is a cyclic number.

It is not a de Polignac number, because 12111211 - 2⁹ = 12110699 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12111217) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 69921 + ... + 70093.

It is an arithmetic number, because the mean of its divisors is an integer number (888444).

Almost surely, 2^12111211 is an apocalyptic number.

12111211 is a deficient number, since it is larger than the sum of its proper divisors (2103893).

12111211 is a wasteful number, since it uses less digits than its factorization.

12111211 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 390.

The product of its digits is 4, while the sum is 10.

The square root of 12111211 is about 3480.1165210378. The cubic root of 12111211 is about 229.6479238367.

Adding to 12111211 its reverse (11211121), we get a palindrome (23322332).

It can be divided in two parts, 121 and 11211, that multiplied together give a palindrome (1356531).

The spelling of 12111211 in words is "twelve million, one hundred eleven thousand, two hundred eleven".