12111111203121 has 12 divisors (see below), whose sum is σ = 19992945478272. Its totient is φ = 6920634973176.

The previous prime is 12111111203111. The next prime is 12111111203159. The reversal of 12111111203121 is 12130211111121.

12111111203121 is a `hidden beast` number, since 121 + 1 + 111 + 120 + 312 + 1 = 666.

12111111203121 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 12111111203121 - 2¹¹ = 12111111201073 is a prime.

It is a super-2 number, since 2×12111111203121² (a number of 27 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 12111111203094 and 12111111203103.

It is not an unprimeable number, because it can be changed into a prime (12111111203111) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 96119930121 + ... + 96119930246.

It is an arithmetic number, because the mean of its divisors is an integer number (1666078789856).

Almost surely, 2^{12111111203121} is an apocalyptic number.

It is an amenable number.

12111111203121 is a deficient number, since it is larger than the sum of its proper divisors (7881834275151).

12111111203121 is a wasteful number, since it uses less digits than its factorization.

12111111203121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 192239860380 (or 192239860377 counting only the distinct ones).

The product of its (nonzero) digits is 24, while the sum is 18.

Adding to 12111111203121 its reverse (12130211111121), we get a palindrome (24241322314242).

The spelling of 12111111203121 in words is "twelve trillion, one hundred eleven billion, one hundred eleven million, two hundred three thousand, one hundred twenty-one".