11211222112221 has 16 divisors (see below), whose sum is σ = 15404701140864. Its totient is φ = 7247324447424.

The previous prime is 11211222112183. The next prime is 11211222112229. The reversal of 11211222112221 is 12221122211211.

It is not a de Polignac number, because 11211222112221 - 2¹⁰ = 11211222111197 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11211222112229) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 172325841 + ... + 172390886.

It is an arithmetic number, because the mean of its divisors is an integer number (962793821304).

Almost surely, 2^{11211222112221} is an apocalyptic number.

It is an amenable number.

11211222112221 is a deficient number, since it is larger than the sum of its proper divisors (4193479028643).

11211222112221 is a wasteful number, since it uses less digits than its factorization.

11211222112221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 344717060.

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

Adding to 11211222112221 its reverse (12221122211211), we get a palindrome (23432344323432).

The spelling of 11211222112221 in words is "eleven trillion, two hundred eleven billion, two hundred twenty-two million, one hundred twelve thousand, two hundred twenty-one".