33223221 has 6 divisors (see below), whose sum is σ = 47989110. Its totient is φ = 22148808.

The previous prime is 33223217. The next prime is 33223261. The reversal of 33223221 is 12232233.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 19980900 + 13242321 = 4470^2 + 3639^2 .

It is not a de Polignac number, because 33223221 - 2² = 33223217 is a prime.

It is a super-2 number, since 2×33223221² = 2207564827229682, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 33223194 and 33223203.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (33223261) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1845726 + ... + 1845743.

It is an arithmetic number, because the mean of its divisors is an integer number (7998185).

Almost surely, 2^33223221 is an apocalyptic number.

It is an amenable number.

33223221 is a deficient number, since it is larger than the sum of its proper divisors (14765889).

33223221 is a wasteful number, since it uses less digits than its factorization.

33223221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3691475 (or 3691472 counting only the distinct ones).

The product of its digits is 432, while the sum is 18.

The square root of 33223221 is about 5763.9587958277. The cubic root of 33223221 is about 321.4750296445.

Adding to 33223221 its reverse (12232233), we get a palindrome (45455454).

The spelling of 33223221 in words is "thirty-three million, two hundred twenty-three thousand, two hundred twenty-one".