221123204 has 12 divisors (see below), whose sum is σ = 390582864. Its totient is φ = 109528104.

The previous prime is 221123191. The next prime is 221123213. The reversal of 221123204 is 402321122.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 257894 + ... + 258749.

It is an arithmetic number, because the mean of its divisors is an integer number (32548572).

Almost surely, 2^221123204 is an apocalyptic number.

It is an amenable number.

221123204 is a deficient number, since it is larger than the sum of its proper divisors (169459660).

221123204 is a wasteful number, since it uses less digits than its factorization.

221123204 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 516754 (or 516752 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 17.

The square root of 221123204 is about 14870.2119688994. The cubic root of 221123204 is about 604.7066893233.

Adding to 221123204 its reverse (402321122), we get a palindrome (623444326).

The spelling of 221123204 in words is "two hundred twenty-one million, one hundred twenty-three thousand, two hundred four".