221165223 has 32 divisors (see below), whose sum is σ = 324907200. Its totient is φ = 133195776.

The previous prime is 221165207. The next prime is 221165227. The reversal of 221165223 is 322561122.

It is not a de Polignac number, because 221165223 - 2⁴ = 221165207 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 221165193 and 221165202.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221165227) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 338365 + ... + 339017.

It is an arithmetic number, because the mean of its divisors is an integer number (10153350).

Almost surely, 2^221165223 is an apocalyptic number.

221165223 is a deficient number, since it is larger than the sum of its proper divisors (103741977).

221165223 is a wasteful number, since it uses less digits than its factorization.

221165223 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 931.

The product of its digits is 1440, while the sum is 24.

The square root of 221165223 is about 14871.6247599245. The cubic root of 221165223 is about 604.7449900845.

The spelling of 221165223 in words is "two hundred twenty-one million, one hundred sixty-five thousand, two hundred twenty-three".