32223221 has 6 divisors (see below), whose sum is σ = 34008822. Its totient is φ = 30526920.

The previous prime is 32223209. The next prime is 32223227. The reversal of 32223221 is 12232223.

It can be written as a sum of positive squares in only one way, i.e., 26122321 + 6100900 = 5111^2 + 2470^2 .

It is a de Polignac number, because none of the positive numbers 2^k-32223221 is a prime.

It is a super-2 number, since 2×32223221² = 2076671943229682, which contains 22 as substring.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 32223221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (32223227) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 44270 + ... + 44991.

It is an arithmetic number, because the mean of its divisors is an integer number (5668137).

Almost surely, 2^32223221 is an apocalyptic number.

It is an amenable number.

32223221 is a deficient number, since it is larger than the sum of its proper divisors (1785601).

32223221 is an equidigital number, since it uses as much as digits as its factorization.

32223221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 89299 (or 89280 counting only the distinct ones).

The product of its digits is 288, while the sum is 17.

The square root of 32223221 is about 5676.5500966696. The cubic root of 32223221 is about 318.2167114510.

Adding to 32223221 its reverse (12232223), we get a palindrome (44455444).

The spelling of 32223221 in words is "thirty-two million, two hundred twenty-three thousand, two hundred twenty-one".