11111221200 has 120 divisors (see below), whose sum is σ = 35681545600. Its totient is φ = 2955617280.

The previous prime is 11111221193. The next prime is 11111221201. The reversal of 11111221200 is 212211111.

11111221200 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a tau number, because it is divible by the number of its divisors (120).

It is a Harshad number since it is a multiple of its sum of digits (12).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11111221201) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 479481 + ... + 502119.

Almost surely, 2^11111221200 is an apocalyptic number.

11111221200 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 11111221200, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (17840772800).

11111221200 is an abundant number, since it is smaller than the sum of its proper divisors (24570324400).

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

11111221200 is a wasteful number, since it uses less digits than its factorization.

11111221200 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23069 (or 23058 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 12.

Adding to 11111221200 its reverse (212211111), we get a palindrome (11323432311).

The spelling of 11111221200 in words is "eleven billion, one hundred eleven million, two hundred twenty-one thousand, two hundred".