221130009 has 6 divisors (see below), whose sum is σ = 319410026. Its totient is φ = 147420000.

The previous prime is 221130001. The next prime is 221130031. The reversal of 221130009 is 900031122.

It is a happy number.

221130009 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 only one way, i.e., 220611609 + 518400 = 14853^2 + 720^2 .

It is not a de Polignac number, because 221130009 - 2³ = 221130001 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 221129973 and 221130000.

It is not an unprimeable number, because it can be changed into a prime (221130001) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 12284992 + ... + 12285009.

Almost surely, 2^221130009 is an apocalyptic number.

It is an amenable number.

221130009 is a deficient number, since it is larger than the sum of its proper divisors (98280017).

221130009 is a wasteful number, since it uses less digits than its factorization.

221130009 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24570007 (or 24570004 counting only the distinct ones).

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

The square root of 221130009 is about 14870.4407802862. The cubic root of 221130009 is about 604.7128924817.

The spelling of 221130009 in words is "two hundred twenty-one million, one hundred thirty thousand, nine".