11100112221 has 32 divisors (see below), whose sum is σ = 16601325696. Its totient is φ = 6537888000.

The previous prime is 11100112157. The next prime is 11100112249. The reversal of 11100112221 is 12221100111.

It is not a de Polignac number, because 11100112221 - 2⁶ = 11100112157 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 11100112197 and 11100112206.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11100112921) 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, 1144131 + ... + 1153791.

It is an arithmetic number, because the mean of its divisors is an integer number (518791428).

Almost surely, 2^11100112221 is an apocalyptic number.

11100112221 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

11100112221 is a deficient number, since it is larger than the sum of its proper divisors (5501213475).

11100112221 is a wasteful number, since it uses less digits than its factorization.

11100112221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10653.

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

Adding to 11100112221 its reverse (12221100111), we get a palindrome (23321212332).

It can be divided in two parts, 11100 and 112221, that added together give a palindrome (123321).

The spelling of 11100112221 in words is "eleven billion, one hundred million, one hundred twelve thousand, two hundred twenty-one".