12121122111111 has 24 divisors (see below), whose sum is σ = 19041762806976. Its totient is φ = 7385299070400.

The previous prime is 12121122111097. The next prime is 12121122111113. The reversal of 12121122111111 is 11111122112121.

12121122111111 is a `hidden beast` number, since 121 + 211 + 221 + 1 + 1 + 111 = 666.

It is not a de Polignac number, because 12121122111111 - 2¹⁰ = 12121122110087 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12121122111113) 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, 512856175 + ... + 512879808.

It is an arithmetic number, because the mean of its divisors is an integer number (793406783624).

Almost surely, 2^{12121122111111} is an apocalyptic number.

12121122111111 is a deficient number, since it is larger than the sum of its proper divisors (6920640695865).

12121122111111 is a wasteful number, since it uses less digits than its factorization.

12121122111111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1025736103 (or 1025736100 counting only the distinct ones).

The product of its digits is 16, while the sum is 18.

Adding to 12121122111111 its reverse (11111122112121), we get a palindrome (23232244223232).

The spelling of 12121122111111 in words is "twelve trillion, one hundred twenty-one billion, one hundred twenty-two million, one hundred eleven thousand, one hundred eleven".