2211111211121 has 4 divisors (see below), whose sum is σ = 2215153462512. Its totient is φ = 2207068959732.

The previous prime is 2211111211097. The next prime is 2211111211147. The reversal of 2211111211121 is 1211121111122.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 2211111211121 - 2¹⁰ = 2211111210097 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 2211111211121.

It is not an unprimeable number, because it can be changed into a prime (2211111211021) 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, 2021124875 + ... + 2021125968.

It is an arithmetic number, because the mean of its divisors is an integer number (553788365628).

Almost surely, 2^{2211111211121} is an apocalyptic number.

It is an amenable number.

2211111211121 is a deficient number, since it is larger than the sum of its proper divisors (4042251391).

2211111211121 is an equidigital number, since it uses as much as digits as its factorization.

2211111211121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4042251390.

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

Adding to 2211111211121 its reverse (1211121111122), we get a palindrome (3422232322243).

Subtracting from 2211111211121 its reverse (1211121111122), we obtain a palindrome (999990099999).

The spelling of 2211111211121 in words is "two trillion, two hundred eleven billion, one hundred eleven million, two hundred eleven thousand, one hundred twenty-one".