12111112012121 has 4 divisors (see below), whose sum is σ = 12111555069492. Its totient is φ = 12110668954752.

The previous prime is 12111112012091. The next prime is 12111112012141. The reversal of 12111112012121 is 12121021111121.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 11880678410896 + 230433601225 = 3446836^2 + 480035^2 .

It is a cyclic number.

It is not a de Polignac number, because 12111112012121 - 2³⁴ = 12093932142937 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 12111112012121.

It is not an unprimeable number, because it can be changed into a prime (12111112012141) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 221487680 + ... + 221542353.

It is an arithmetic number, because the mean of its divisors is an integer number (3027888767373).

Almost surely, 2^{12111112012121} is an apocalyptic number.

It is an amenable number.

12111112012121 is a deficient number, since it is larger than the sum of its proper divisors (443057371).

12111112012121 is an equidigital number, since it uses as much as digits as its factorization.

12111112012121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 443057370.

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

Adding to 12111112012121 its reverse (12121021111121), we get a palindrome (24232133123242).

The spelling of 12111112012121 in words is "twelve trillion, one hundred eleven billion, one hundred twelve million, twelve thousand, one hundred twenty-one".