12111001001111 has 2 divisors, whose sum is σ = 12111001001112. Its totient is φ = 12111001001110.

The previous prime is 12111001001107. The next prime is 12111001001123. The reversal of 12111001001111 is 11110010011121.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 12111001001111 - 2² = 12111001001107 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 12111001001092 and 12111001001101.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12111001301111) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6055500500555 + 6055500500556.

It is an arithmetic number, because the mean of its divisors is an integer number (6055500500556).

Almost surely, 2^{12111001001111} is an apocalyptic number.

12111001001111 is a deficient number, since it is larger than the sum of its proper divisors (1).

12111001001111 is an equidigital number, since it uses as much as digits as its factorization.

12111001001111 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2, while the sum is 11.

Adding to 12111001001111 its reverse (11110010011121), we get a palindrome (23221011012232).

It can be divided in two parts, 1 and 2111001001111, that added together give a palindrome (2111001001112).

The spelling of 12111001001111 in words is "twelve trillion, one hundred eleven billion, one million, one thousand, one hundred eleven".