11100100001220 has 120 divisors (see below), whose sum is σ = 34850766513024. Its totient is φ = 2957532450624.

The previous prime is 11100100001191. The next prime is 11100100001239. The reversal of 11100100001220 is 2210000100111.

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 pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 963292 + ... + 4809171.

Almost surely, 2^{11100100001220} is an apocalyptic number.

11100100001220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 11100100001220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (17425383256512).

11100100001220 is an abundant number, since it is smaller than the sum of its proper divisors (23750666511804).

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

11100100001220 is a wasteful number, since it uses less digits than its factorization.

11100100001220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5773671 (or 5773660 counting only the distinct ones).

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

Adding to 11100100001220 its reverse (2210000100111), we get a palindrome (13310100101331).

The spelling of 11100100001220 in words is "eleven trillion, one hundred billion, one hundred million, one thousand, two hundred twenty".