11100011220 has 36 divisors (see below), whose sum is σ = 33670034580. Its totient is φ = 2960002944.

The previous prime is 11100011191. The next prime is 11100011231. The reversal of 11100011220 is 2211000111.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 8561060676 + 2538950544 = 92526^2 + 50388^2 .

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 (9).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 30833185 + ... + 30833544.

Almost surely, 2^11100011220 is an apocalyptic number.

11100011220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

11100011220 is an abundant number, since it is smaller than the sum of its proper divisors (22570023360).

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

11100011220 is a wasteful number, since it uses less digits than its factorization.

11100011220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 61666744 (or 61666739 counting only the distinct ones).

The product of its (nonzero) digits is 4, while the sum is 9.

Adding to 11100011220 its reverse (2211000111), we get a palindrome (13311011331).

The spelling of 11100011220 in words is "eleven billion, one hundred million, eleven thousand, two hundred twenty".