11211111100 has 72 divisors (see below), whose sum is σ = 28079015328. Its totient is φ = 3805728000.

The previous prime is 11211111097. The next prime is 11211111151. The reversal of 11211111100 is 111111211.

It is a Harshad number since it is a multiple of its sum of digits (10).

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, 8587 + ... + 149986.

It is an arithmetic number, because the mean of its divisors is an integer number (389986324).

Almost surely, 2^11211111100 is an apocalyptic number.

11211111100 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 11211111100, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (14039507664).

11211111100 is an abundant number, since it is smaller than the sum of its proper divisors (16867904228).

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

11211111100 is a wasteful number, since it uses less digits than its factorization.

11211111100 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 158695 (or 158688 counting only the distinct ones).

The product of its (nonzero) digits is 2, while the sum is 10.

Adding to 11211111100 its reverse (111111211), we get a palindrome (11322222311).

It can be divided in two parts, 11211111 and 100, that added together give a palindrome (11211211).

The spelling of 11211111100 in words is "eleven billion, two hundred eleven million, one hundred eleven thousand, one hundred".