12011121222111 has 24 divisors (see below), whose sum is σ = 18928319486544. Its totient is φ = 7278811935360.

The previous prime is 12011121222077. The next prime is 12011121222151. The reversal of 12011121222111 is 11122212111021.

It is a happy number.

12011121222111 is a `hidden beast` number, since 120 + 111 + 212 + 221 + 1 + 1 = 666.

It is not a de Polignac number, because 12011121222111 - 2⁶ = 12011121222047 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12011121222151) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 4356126 + ... + 6557291.

It is an arithmetic number, because the mean of its divisors is an integer number (788679978606).

Almost surely, 2^{12011121222111} is an apocalyptic number.

12011121222111 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

12011121222111 is a deficient number, since it is larger than the sum of its proper divisors (6917198264433).

12011121222111 is a wasteful number, since it uses less digits than its factorization.

12011121222111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10924551 (or 10924548 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 18.

Adding to 12011121222111 its reverse (11122212111021), we get a palindrome (23133333333132).

The spelling of 12011121222111 in words is "twelve trillion, eleven billion, one hundred twenty-one million, two hundred twenty-two thousand, one hundred eleven".