9111221118 has 64 divisors (see below), whose sum is σ = 20559052800. Its totient is φ = 2990403360.

The previous prime is 9111221117. The next prime is 9111221123. The reversal of 9111221118 is 8111221119.

It is a super-2 number, since 2×9111221118² (a number of 21 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a junction number, because it is equal to n+sod(n) for n = 9111221091 and 9111221100.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9111221113) 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, 5477955 + ... + 5479617.

It is an arithmetic number, because the mean of its divisors is an integer number (321235200).

Almost surely, 2^9111221118 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 9111221118, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (10279526400).

9111221118 is an abundant number, since it is smaller than the sum of its proper divisors (11447831682).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

9111221118 is a wasteful number, since it uses less digits than its factorization.

9111221118 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3174 (or 3168 counting only the distinct ones).

The product of its digits is 288, while the sum is 27.

The square root of 9111221118 is about 95452.7166611826. The cubic root of 9111221118 is about 2088.6172578891.

Subtracting from 9111221118 its reverse (8111221119), we obtain a palindrome (999999999).

The spelling of 9111221118 in words is "nine billion, one hundred eleven million, two hundred twenty-one thousand, one hundred eighteen".