223531221 has 8 divisors (see below), whose sum is σ = 305311104. Its totient is φ = 145386080.

The previous prime is 223531193. The next prime is 223531223. The reversal of 223531221 is 122135322.

223531221 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 223531221 - 2⁷ = 223531093 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (223531223) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 908541 + ... + 908786.

It is an arithmetic number, because the mean of its divisors is an integer number (38163888).

Almost surely, 2^223531221 is an apocalyptic number.

It is an amenable number.

223531221 is a deficient number, since it is larger than the sum of its proper divisors (81779883).

223531221 is a wasteful number, since it uses less digits than its factorization.

223531221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1817371.

The product of its digits is 720, while the sum is 21.

The square root of 223531221 is about 14950.9605377046. The cubic root of 223531221 is about 606.8938410101.

Adding to 223531221 its reverse (122135322), we get a palindrome (345666543).

The spelling of 223531221 in words is "two hundred twenty-three million, five hundred thirty-one thousand, two hundred twenty-one".