221440009 has 8 divisors (see below), whose sum is σ = 255532160. Its totient is φ = 187962336.

The previous prime is 221440007. The next prime is 221440013. The reversal of 221440009 is 900044122.

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

It is a cyclic number.

It is not a de Polignac number, because 221440009 - 2¹ = 221440007 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (221440007) 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, 152844 + ... + 154285.

It is an arithmetic number, because the mean of its divisors is an integer number (31941520).

Almost surely, 2^221440009 is an apocalyptic number.

It is an amenable number.

221440009 is a deficient number, since it is larger than the sum of its proper divisors (34092151).

221440009 is a wasteful number, since it uses less digits than its factorization.

221440009 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 307239.

The product of its (nonzero) digits is 576, while the sum is 22.

The square root of 221440009 is about 14880.8604925925. The cubic root of 221440009 is about 604.9953409017.

The spelling of 221440009 in words is "two hundred twenty-one million, four hundred forty thousand, nine".