221103009 has 12 divisors (see below), whose sum is σ = 328003156. Its totient is φ = 143417952.

The previous prime is 221103007. The next prime is 221103059. The reversal of 221103009 is 900301122.

It is a happy number.

221103009 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 2 ways, for example, as 107744400 + 113358609 = 10380^2 + 10647^2 .

It is not a de Polignac number, because 221103009 - 2¹ = 221103007 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 221102982 and 221103000.

It is not an unprimeable number, because it can be changed into a prime (221103007) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 331654 + ... + 332319.

Almost surely, 2^221103009 is an apocalyptic number.

It is an amenable number.

221103009 is a deficient number, since it is larger than the sum of its proper divisors (106900147).

221103009 is a wasteful number, since it uses less digits than its factorization.

221103009 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 664016 (or 664013 counting only the distinct ones).

The product of its (nonzero) digits is 108, while the sum is 18.

The square root of 221103009 is about 14869.5329112921. The cubic root of 221103009 is about 604.6882796416.

The spelling of 221103009 in words is "two hundred twenty-one million, one hundred three thousand, nine".