12011121212111 has 32 divisors (see below), whose sum is σ = 14049201223680. Its totient is φ = 10055865820896.

The previous prime is 12011121212107. The next prime is 12011121212161. The reversal of 12011121212111 is 11121212111021.

It is not a de Polignac number, because 12011121212111 - 2² = 12011121212107 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 12011121212111.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12011121212161) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 262992500 + ... + 263038166.

It is an arithmetic number, because the mean of its divisors is an integer number (439037538240).

Almost surely, 2^{12011121212111} is an apocalyptic number.

12011121212111 is a deficient number, since it is larger than the sum of its proper divisors (2038080011569).

12011121212111 is a wasteful number, since it uses less digits than its factorization.

12011121212111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 49803.

The product of its (nonzero) digits is 16, while the sum is 17.

Adding to 12011121212111 its reverse (11121212111021), we get a palindrome (23132333323132).

The spelling of 12011121212111 in words is "twelve trillion, eleven billion, one hundred twenty-one million, two hundred twelve thousand, one hundred eleven".