1100221200 has 180 divisors, whose sum is σ = 4111946020. Its totient is φ = 270812160.

The previous prime is 1100221151. The next prime is 1100221207. The reversal of 1100221200 is 21220011.

It can be written as a sum of positive squares in 6 ways, for example, as 104976 + 1100116224 = 324^2 + 33168^2 .

It is a tau number, because it is divible by the number of its divisors (180).

It is a Harshad number since it is a multiple of its sum of digits (9).

It is not an unprimeable number, because it can be changed into a prime (1100221207) by changing a digit.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 35046 + ... + 58554.

Almost surely, 2^1100221200 is an apocalyptic number.

1100221200 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 1100221200, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2055973010).

1100221200 is an abundant number, since it is smaller than the sum of its proper divisors (3011724820).

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

1100221200 is a wasteful number, since it uses less digits than its factorization.

1100221200 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23546 (or 23532 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 9.

The square root of 1100221200 is about 33169.5824513966. The cubic root of 1100221200 is about 1032.3493048677.

Adding to 1100221200 its reverse (21220011), we get a palindrome (1121441211).

The spelling of 1100221200 in words is "one billion, one hundred million, two hundred twenty-one thousand, two hundred".