221094809 has 8 divisors (see below), whose sum is σ = 252108360. Its totient is φ = 192082176.

The previous prime is 221094803. The next prime is 221094823. The reversal of 221094809 is 908490122.

It can be written as a sum of positive squares in 4 ways, for example, as 77933584 + 143161225 = 8828^2 + 11965^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 221094809 - 2⁸ = 221094553 is a prime.

It is a Duffinian number.

221094809 is a modest number, since divided by 94809 gives 221 as remainder.

It is not an unprimeable number, because it can be changed into a prime (221094803) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 499994 + ... + 500435.

It is an arithmetic number, because the mean of its divisors is an integer number (31513545).

Almost surely, 2^221094809 is an apocalyptic number.

It is an amenable number.

221094809 is a deficient number, since it is larger than the sum of its proper divisors (31013551).

221094809 is a wasteful number, since it uses less digits than its factorization.

221094809 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1000459.

The product of its (nonzero) digits is 10368, while the sum is 35.

The square root of 221094809 is about 14869.2571771424. The cubic root of 221094809 is about 604.6808042343.

The spelling of 221094809 in words is "two hundred twenty-one million, ninety-four thousand, eight hundred nine".