223205221 has 4 divisors (see below), whose sum is σ = 223236000. Its totient is φ = 223174444.

The previous prime is 223205219. The next prime is 223205231. The reversal of 223205221 is 122502322.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 223205221 - 2¹ = 223205219 is a prime.

It is a super-3 number, since 3×223205221³ (a number of 26 digits) contains 333 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (223205231) 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 3 ways as a sum of consecutive naturals, for example, 2160 + ... + 21238.

It is an arithmetic number, because the mean of its divisors is an integer number (55809000).

Almost surely, 2^223205221 is an apocalyptic number.

It is an amenable number.

223205221 is a deficient number, since it is larger than the sum of its proper divisors (30779).

223205221 is a wasteful number, since it uses less digits than its factorization.

223205221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30778.

The product of its (nonzero) digits is 480, while the sum is 19.

The square root of 223205221 is about 14940.0542502362. The cubic root of 223205221 is about 606.5986642706.

Adding to 223205221 its reverse (122502322), we get a palindrome (345707543).

The spelling of 223205221 in words is "two hundred twenty-three million, two hundred five thousand, two hundred twenty-one".