11112221211121 has 4 divisors (see below), whose sum is σ = 11113974763492. Its totient is φ = 11110467658752.

The previous prime is 11112221211067. The next prime is 11112221211163. The reversal of 11112221211121 is 12111212221111.

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 2119749636096 + 8992471575025 = 1455936^2 + 2998745^2 .

It is a cyclic number.

It is not a de Polignac number, because 11112221211121 - 2¹¹ = 11112221209073 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (11112221211821) 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, 876766680 + ... + 876779353.

It is an arithmetic number, because the mean of its divisors is an integer number (2778493690873).

Almost surely, 2^{11112221211121} is an apocalyptic number.

It is an amenable number.

11112221211121 is a deficient number, since it is larger than the sum of its proper divisors (1753552371).

11112221211121 is an equidigital number, since it uses as much as digits as its factorization.

11112221211121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1753552370.

The product of its digits is 32, while the sum is 19.

Adding to 11112221211121 its reverse (12111212221111), we get a palindrome (23223433432232).

The spelling of 11112221211121 in words is "eleven trillion, one hundred twelve billion, two hundred twenty-one million, two hundred eleven thousand, one hundred twenty-one".