111221021220 has 48 divisors (see below), whose sum is σ = 314442360960. Its totient is φ = 29370986496.

The previous prime is 111221021167. The next prime is 111221021227. The reversal of 111221021220 is 22120122111.

It is a super-2 number, since 2×111221021220² (a number of 23 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a self number, because there is not a number n which added to its sum of digits gives 111221021220.

It is not an unprimeable number, because it can be changed into a prime (111221021227) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 8992285 + ... + 9004644.

It is an arithmetic number, because the mean of its divisors is an integer number (6550882520).

Almost surely, 2^111221021220 is an apocalyptic number.

111221021220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

111221021220 is an abundant number, since it is smaller than the sum of its proper divisors (203221339740).

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

111221021220 is a wasteful number, since it uses less digits than its factorization.

111221021220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17997044 (or 17997042 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 15.

Adding to 111221021220 its reverse (22120122111), we get a palindrome (133341143331).

The spelling of 111221021220 in words is "one hundred eleven billion, two hundred twenty-one million, twenty-one thousand, two hundred twenty".