11011991100 has 72 divisors (see below), whose sum is σ = 34757858688. Its totient is φ = 2669572800.

The previous prime is 11011991071. The next prime is 11011991117. The reversal of 11011991100 is 119911011.

It is a congruent number.

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, 1665184 + ... + 1671783.

Almost surely, 2^11011991100 is an apocalyptic number.

11011991100 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

11011991100 is an abundant number, since it is smaller than the sum of its proper divisors (23745867588).

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

11011991100 is a wasteful number, since it uses less digits than its factorization.

11011991100 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3336995 (or 3336988 counting only the distinct ones).

The product of its (nonzero) digits is 81, while the sum is 24.

It can be divided in two parts, 1 and 1011991100, that added together give a palindrome (1011991101).

The spelling of 11011991100 in words is "eleven billion, eleven million, nine hundred ninety-one thousand, one hundred".