11100211221 has 16 divisors (see below), whose sum is σ = 16521246720. Its totient is φ = 6570948720.

The previous prime is 11100211201. The next prime is 11100211231. The reversal of 11100211221 is 12211200111.

11100211221 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 11100211221 - 2⁵ = 11100211189 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 11100211197 and 11100211206.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11100211201) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3909861 + ... + 3912698.

It is an arithmetic number, because the mean of its divisors is an integer number (1032577920).

Almost surely, 2^11100211221 is an apocalyptic number.

11100211221 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

11100211221 is a deficient number, since it is larger than the sum of its proper divisors (5421035499).

11100211221 is a wasteful number, since it uses less digits than its factorization.

11100211221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7822616.

The product of its (nonzero) digits is 8, while the sum is 12.

Adding to 11100211221 its reverse (12211200111), we get a palindrome (23311411332).

The spelling of 11100211221 in words is "eleven billion, one hundred million, two hundred eleven thousand, two hundred twenty-one".