111221303220 has 36 divisors (see below), whose sum is σ = 337371286980. Its totient is φ = 29659014144.

The previous prime is 111221303213. The next prime is 111221303227. The reversal of 111221303220 is 22303122111.

It is an interprime number because it is at equal distance from previous prime (111221303213) and next prime (111221303227).

It can be written as a sum of positive squares in 2 ways, for example, as 15910795044 + 95310508176 = 126138^2 + 308724^2 .

It is a tau number, because it is divible by the number of its divisors (36).

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

It is a junction number, because it is equal to n+sod(n) for n = 111221303193 and 111221303202.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (111221303227) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 308947885 + ... + 308948244.

Almost surely, 2^111221303220 is an apocalyptic number.

111221303220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

111221303220 is an abundant number, since it is smaller than the sum of its proper divisors (226149983760).

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

111221303220 is a wasteful number, since it uses less digits than its factorization.

111221303220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 617896144 (or 617896139 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 18.

Adding to 111221303220 its reverse (22303122111), we get a palindrome (133524425331).

The spelling of 111221303220 in words is "one hundred eleven billion, two hundred twenty-one million, three hundred three thousand, two hundred twenty".