33233221 has 6 divisors (see below), whose sum is σ = 38659110. Its totient is φ = 28485576.

The previous prime is 33233219. The next prime is 33233243. The reversal of 33233221 is 12233233.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 33189121 + 44100 = 5761^2 + 210^2 .

It is not a de Polignac number, because 33233221 - 2¹ = 33233219 is a prime.

It is a super-2 number, since 2×33233221² = 2208893956069682, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (33233251) 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, 339066 + ... + 339163.

It is an arithmetic number, because the mean of its divisors is an integer number (6443185).

Almost surely, 2^33233221 is an apocalyptic number.

It is an amenable number.

33233221 is a deficient number, since it is larger than the sum of its proper divisors (5425889).

33233221 is an equidigital number, since it uses as much as digits as its factorization.

33233221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 678243 (or 678236 counting only the distinct ones).

The product of its digits is 648, while the sum is 19.

The square root of 33233221 is about 5764.8261899211. The cubic root of 33233221 is about 321.5072804590.

Adding to 33233221 its reverse (12233233), we get a palindrome (45466454).

The spelling of 33233221 in words is "thirty-three million, two hundred thirty-three thousand, two hundred twenty-one".