221909222 has 16 divisors (see below), whose sum is σ = 348447744. Its totient is φ = 105861000.

The previous prime is 221909213. The next prime is 221909243. The reversal of 221909222 is 222909122.

It is a congruent number.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 20804 + ... + 29607.

It is an arithmetic number, because the mean of its divisors is an integer number (21777984).

Almost surely, 2^221909222 is an apocalyptic number.

221909222 is a deficient number, since it is larger than the sum of its proper divisors (126538522).

221909222 is a wasteful number, since it uses less digits than its factorization.

221909222 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 50515.

The product of its (nonzero) digits is 2592, while the sum is 29.

The square root of 221909222 is about 14896.6178040520. The cubic root of 221909222 is about 605.4223510818.

The spelling of 221909222 in words is "two hundred twenty-one million, nine hundred nine thousand, two hundred twenty-two".