12011001111 has 8 divisors (see below), whose sum is σ = 17794075760. Its totient is φ = 8007334056.

The previous prime is 12011001071. The next prime is 12011001133. The reversal of 12011001111 is 11110011021.

It is not a de Polignac number, because 12011001111 - 2⁶ = 12011001047 is a prime.

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

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 12011001093 and 12011001102.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12011001811) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 222425920 + ... + 222425973.

It is an arithmetic number, because the mean of its divisors is an integer number (2224259470).

Almost surely, 2^12011001111 is an apocalyptic number.

12011001111 is a deficient number, since it is larger than the sum of its proper divisors (5783074649).

12011001111 is an equidigital number, since it uses as much as digits as its factorization.

12011001111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 444851902 (or 444851896 counting only the distinct ones).

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

Adding to 12011001111 its reverse (11110011021), we get a palindrome (23121012132).

The spelling of 12011001111 in words is "twelve billion, eleven million, one thousand, one hundred eleven".