12111200111 has 4 divisors (see below), whose sum is σ = 12120100224. Its totient is φ = 12102300000.

The previous prime is 12111200107. The next prime is 12111200119. The reversal of 12111200111 is 11100211121.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 11100211121 = 1051 ⋅10561571.

It is a cyclic number.

It is not a de Polignac number, because 12111200111 - 2² = 12111200107 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 12111200092 and 12111200101.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12111200119) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4448015 + ... + 4450736.

It is an arithmetic number, because the mean of its divisors is an integer number (3030025056).

Almost surely, 2^12111200111 is an apocalyptic number.

12111200111 is a deficient number, since it is larger than the sum of its proper divisors (8900113).

12111200111 is an equidigital number, since it uses as much as digits as its factorization.

12111200111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8900112.

The product of its (nonzero) digits is 4, while the sum is 11.

Adding to 12111200111 its reverse (11100211121), we get a palindrome (23211411232).

The spelling of 12111200111 in words is "twelve billion, one hundred eleven million, two hundred thousand, one hundred eleven".