12011100111 has 24 divisors (see below), whose sum is σ = 17582136000. Its totient is φ = 7900587072.

The previous prime is 12011100107. The next prime is 12011100121. The reversal of 12011100111 is 11100111021.

It is not a de Polignac number, because 12011100111 - 2² = 12011100107 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (9).

It is a junction number, because it is equal to n+sod(n) for n = 12011100093 and 12011100102.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12011100121) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 208845 + ... + 260073.

It is an arithmetic number, because the mean of its divisors is an integer number (732589000).

Almost surely, 2^12011100111 is an apocalyptic number.

12011100111 is a deficient number, since it is larger than the sum of its proper divisors (5571035889).

12011100111 is a wasteful number, since it uses less digits than its factorization.

12011100111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 51583 (or 51580 counting only the distinct ones).

The product of its (nonzero) digits is 2, while the sum is 9.

Adding to 12011100111 its reverse (11100111021), we get a palindrome (23111211132).

The spelling of 12011100111 in words is "twelve billion, eleven million, one hundred thousand, one hundred eleven".