11111001100 has 72 divisors (see below), whose sum is σ = 25639640208. Its totient is φ = 4164864000.

The previous prime is 11111001061. The next prime is 11111001149. The reversal of 11111001100 is 110011111.

It is a happy number.

It is a zygodrome in base 10.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 382075 + ... + 410125.

It is an arithmetic number, because the mean of its divisors is an integer number (356106114).

Almost surely, 2^11111001100 is an apocalyptic number.

11111001100 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 11111001100, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (12819820104).

11111001100 is an abundant number, since it is smaller than the sum of its proper divisors (14528639108).

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

11111001100 is a wasteful number, since it uses less digits than its factorization.

11111001100 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28315 (or 28308 counting only the distinct ones).

The product of its (nonzero) digits is 1, while the sum is 7.

Adding to 11111001100 its reverse (110011111), we get a palindrome (11221012211).

The spelling of 11111001100 in words is "eleven billion, one hundred eleven million, one thousand, one hundred".