11199988900 has 81 divisors (see below), whose sum is σ = 25696590339. Its totient is φ = 4236586560.

The previous prime is 11199988889. The next prime is 11199988963. The reversal of 11199988900 is 988999111.

The square root of 11199988900 is 105830.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in 4 ways, for example, as 3850698916 + 7349289984 = 62054^2 + 85728^2 .

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 20107422 + ... + 20107978.

Almost surely, 2^11199988900 is an apocalyptic number.

11199988900 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

11199988900 is the 105830-th square number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 11199988900

11199988900 is an abundant number, since it is smaller than the sum of its proper divisors (14496601439).

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

11199988900 is an equidigital number, since it uses as much as digits as its factorization.

11199988900 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1166 (or 583 counting only the distinct ones).

The product of its (nonzero) digits is 419904, while the sum is 55.

The spelling of 11199988900 in words is "eleven billion, one hundred ninety-nine million, nine hundred eighty-eight thousand, nine hundred".