11122122211221 has 32 divisors (see below), whose sum is σ = 17953319478528. Its totient is φ = 5978851292160.

The previous prime is 11122122211181. The next prime is 11122122211231. The reversal of 11122122211221 is 12211222122111.

11122122211221 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 11122122211221 - 2⁹ = 11122122210709 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11122122211231) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 6511330 + ... + 8040003.

It is an arithmetic number, because the mean of its divisors is an integer number (561041233704).

Almost surely, 2^{11122122211221} is an apocalyptic number.

It is an amenable number.

11122122211221 is a deficient number, since it is larger than the sum of its proper divisors (6831197267307).

11122122211221 is a wasteful number, since it uses less digits than its factorization.

11122122211221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14553501.

The product of its digits is 128, while the sum is 21.

Adding to 11122122211221 its reverse (12211222122111), we get a palindrome (23333344333332).

The spelling of 11122122211221 in words is "eleven trillion, one hundred twenty-two billion, one hundred twenty-two million, two hundred eleven thousand, two hundred twenty-one".