11100112111221 has 24 divisors (see below), whose sum is σ = 17681811248160. Its totient is φ = 6171490900512.

The previous prime is 11100112111177. The next prime is 11100112111223. The reversal of 11100112111221 is 12211121100111.

It is not a de Polignac number, because 11100112111221 - 2¹¹ = 11100112109173 is a prime.

It is a super-2 number, since 2×11100112111221² (a number of 27 digits) contains 22 as substring.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 11100112111221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11100112111223) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1020413031 + ... + 1020423908.

It is an arithmetic number, because the mean of its divisors is an integer number (736742135340).

Almost surely, 2^{11100112111221} is an apocalyptic number.

It is an amenable number.

11100112111221 is a deficient number, since it is larger than the sum of its proper divisors (6581699136939).

11100112111221 is a wasteful number, since it uses less digits than its factorization.

11100112111221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2040836993 (or 2040836986 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 15.

Adding to 11100112111221 its reverse (12211121100111), we get a palindrome (23311233211332).

The spelling of 11100112111221 in words is "eleven trillion, one hundred billion, one hundred twelve million, one hundred eleven thousand, two hundred twenty-one".