223031221 has 8 divisors (see below), whose sum is σ = 255043904. Its totient is φ = 191056320.

The previous prime is 223031203. The next prime is 223031233. The reversal of 223031221 is 122130322.

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

It is not a de Polignac number, because 223031221 - 2¹⁵ = 222998453 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 223031195 and 223031204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (223031201) 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 7 ways as a sum of consecutive naturals, for example, 4606 + ... + 21616.

It is an arithmetic number, because the mean of its divisors is an integer number (31880488).

Almost surely, 2^223031221 is an apocalyptic number.

It is an amenable number.

223031221 is a deficient number, since it is larger than the sum of its proper divisors (32012683).

223031221 is a wasteful number, since it uses less digits than its factorization.

223031221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18891.

The product of its (nonzero) digits is 144, while the sum is 16.

The square root of 223031221 is about 14934.2298428811. The cubic root of 223031221 is about 606.4409982958.

Adding to 223031221 its reverse (122130322), we get a palindrome (345161543).

The spelling of 223031221 in words is "two hundred twenty-three million, thirty-one thousand, two hundred twenty-one".