12011111211 has 16 divisors (see below), whose sum is σ = 17472551040. Its totient is φ = 7278693120.

The previous prime is 12011111207. The next prime is 12011111261. The reversal of 12011111211 is 11211111021.

It is not a de Polignac number, because 12011111211 - 2² = 12011111207 is a prime.

It is not an unprimeable number, because it can be changed into a prime (12011111261) 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, 550060 + ... + 571478.

It is an arithmetic number, because the mean of its divisors is an integer number (1092034440).

Almost surely, 2^12011111211 is an apocalyptic number.

12011111211 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

12011111211 is a deficient number, since it is larger than the sum of its proper divisors (5461439829).

12011111211 is a wasteful number, since it uses less digits than its factorization.

12011111211 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 38426.

The product of its (nonzero) digits is 4, while the sum is 12.

Adding to 12011111211 its reverse (11211111021), we get a palindrome (23222222232).

The spelling of 12011111211 in words is "twelve billion, eleven million, one hundred eleven thousand, two hundred eleven".