221088009 has 32 divisors (see below), whose sum is σ = 330946560. Its totient is φ = 130464000.

The previous prime is 221087981. The next prime is 221088011. The reversal of 221088009 is 900880122.

It is not a de Polignac number, because 221088009 - 2⁹ = 221087497 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (221088089) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 145564 + ... + 147074.

It is an arithmetic number, because the mean of its divisors is an integer number (10342080).

Almost surely, 2^221088009 is an apocalyptic number.

It is an amenable number.

221088009 is a deficient number, since it is larger than the sum of its proper divisors (109858551).

221088009 is a wasteful number, since it uses less digits than its factorization.

221088009 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1701.

The product of its (nonzero) digits is 2304, while the sum is 30.

The square root of 221088009 is about 14869.0285156765. The cubic root of 221088009 is about 604.6746049758.

The spelling of 221088009 in words is "two hundred twenty-one million, eighty-eight thousand, nine".