11110001220 has 72 divisors (see below), whose sum is σ = 33708939264. Its totient is φ = 2961910848.

The previous prime is 11110001207. The next prime is 11110001237. The reversal of 11110001220 is 2210001111.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (9).

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1311037 + ... + 1319483.

It is an arithmetic number, because the mean of its divisors is an integer number (468179712).

Almost surely, 2^11110001220 is an apocalyptic number.

11110001220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

11110001220 is an abundant number, since it is smaller than the sum of its proper divisors (22598938044).

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

11110001220 is a wasteful number, since it uses less digits than its factorization.

11110001220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15769 (or 15764 counting only the distinct ones).

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

Adding to 11110001220 its reverse (2210001111), we get a palindrome (13320002331).

The spelling of 11110001220 in words is "eleven billion, one hundred ten million, one thousand, two hundred twenty".