11212211211121 has 16 divisors (see below), whose sum is σ = 11462791334400. Its totient is φ = 10962135055168.

The previous prime is 11212211211109. The next prime is 11212211211199. The reversal of 11212211211121 is 12111211221211.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-11212211211121 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (11212211211821) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 506572371 + ... + 506594503.

It is an arithmetic number, because the mean of its divisors is an integer number (716424458400).

Almost surely, 2^{11212211211121} is an apocalyptic number.

It is an amenable number.

11212211211121 is a deficient number, since it is larger than the sum of its proper divisors (250580123279).

11212211211121 is a wasteful number, since it uses less digits than its factorization.

11212211211121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33008.

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

Adding to 11212211211121 its reverse (12111211221211), we get a palindrome (23323422432332).

The spelling of 11212211211121 in words is "eleven trillion, two hundred twelve billion, two hundred eleven million, two hundred eleven thousand, one hundred twenty-one".