111221001180 has 60 divisors (see below), whose sum is σ = 348904405080. Its totient is φ = 29658933216.

The previous prime is 111221001179. The next prime is 111221001187. The reversal of 111221001180 is 81100122111.

It is a tau number, because it is divible by the number of its divisors (60).

It is a super-2 number, since 2×111221001180² (a number of 23 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (111221001187) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 34325850 + ... + 34329089.

It is an arithmetic number, because the mean of its divisors is an integer number (5815073418).

Almost surely, 2^111221001180 is an apocalyptic number.

111221001180 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

111221001180 is an abundant number, since it is smaller than the sum of its proper divisors (237683403900).

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

111221001180 is a wasteful number, since it uses less digits than its factorization.

111221001180 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 68654960 (or 68654949 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 18.

Adding to 111221001180 its reverse (81100122111), we get a palindrome (192321123291).

The spelling of 111221001180 in words is "one hundred eleven billion, two hundred twenty-one million, one thousand, one hundred eighty".