12111011111121 has 64 divisors (see below), whose sum is σ = 17623223842560. Its totient is φ = 7353848217600.

The previous prime is 12111011111099. The next prime is 12111011111123. The reversal of 12111011111121 is 12111111011121.

It is a happy number.

It is not a de Polignac number, because 12111011111121 - 2⁹ = 12111011110609 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 12111011111121.

It is not an unprimeable number, because it can be changed into a prime (12111011111123) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 602138361 + ... + 602158473.

It is an arithmetic number, because the mean of its divisors is an integer number (275362872540).

Almost surely, 2^{12111011111121} is an apocalyptic number.

It is an amenable number.

12111011111121 is a deficient number, since it is larger than the sum of its proper divisors (5512212731439).

12111011111121 is a wasteful number, since it uses less digits than its factorization.

12111011111121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20946.

The product of its (nonzero) digits is 4, while the sum is 15.

Adding to 12111011111121 its reverse (12111111011121), we get a palindrome (24222122122242).

The spelling of 12111011111121 in words is "twelve trillion, one hundred eleven billion, eleven million, one hundred eleven thousand, one hundred twenty-one".