11200021209 has 48 divisors (see below), whose sum is σ = 18897160464. Its totient is φ = 6328627200.

The previous prime is 11200021207. The next prime is 11200021237. The reversal of 11200021209 is 90212000211.

11200021209 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 8 ways, for example, as 455625 + 11199565584 = 675^2 + 105828^2 .

It is not a de Polignac number, because 11200021209 - 2¹ = 11200021207 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 11200021191 and 11200021200.

It is not an unprimeable number, because it can be changed into a prime (11200021207) 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 47 ways as a sum of consecutive naturals, for example, 12879 + ... + 150219.

It is an arithmetic number, because the mean of its divisors is an integer number (393690843).

Almost surely, 2^11200021209 is an apocalyptic number.

It is an amenable number.

11200021209 is a deficient number, since it is larger than the sum of its proper divisors (7697139255).

11200021209 is a wasteful number, since it uses less digits than its factorization.

11200021209 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 137418 (or 137415 counting only the distinct ones).

The product of its (nonzero) digits is 72, while the sum is 18.

It can be divided in two parts, 1120002 and 1209, that added together give a palindrome (1121211).

The spelling of 11200021209 in words is "eleven billion, two hundred million, twenty-one thousand, two hundred nine".