223221909 has 16 divisors (see below), whose sum is σ = 302769792. Its totient is φ = 146266368.

The previous prime is 223221881. The next prime is 223221967. The reversal of 223221909 is 909122322.

It is a happy number.

It is not a de Polignac number, because 223221909 - 2⁸ = 223221653 is a prime.

It is a super-3 number, since 3×223221909³ (a number of 26 digits) contains 333 as substring.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (223221989) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 39697 + ... + 44969.

It is an arithmetic number, because the mean of its divisors is an integer number (18923112).

Almost surely, 2^223221909 is an apocalyptic number.

It is an amenable number.

223221909 is a deficient number, since it is larger than the sum of its proper divisors (79547883).

223221909 is a wasteful number, since it uses less digits than its factorization.

223221909 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5516.

The product of its (nonzero) digits is 3888, while the sum is 30.

The square root of 223221909 is about 14940.6127384388. The cubic root of 223221909 is about 606.6137813994.

The spelling of 223221909 in words is "two hundred twenty-three million, two hundred twenty-one thousand, nine hundred nine".