33212221 has 24 divisors (see below), whose sum is σ = 40792320. Its totient is φ = 26445216.

The previous prime is 33212189. The next prime is 33212261. The reversal of 33212221 is 12221233.

It is not a de Polignac number, because 33212221 - 2⁵ = 33212189 is a prime.

It is a super-2 number, since 2×33212221² = 2206103247505682, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 33212195 and 33212204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (33212261) 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 23 ways as a sum of consecutive naturals, for example, 562890 + ... + 562948.

It is an arithmetic number, because the mean of its divisors is an integer number (1699680).

Almost surely, 2^33212221 is an apocalyptic number.

It is an amenable number.

33212221 is a deficient number, since it is larger than the sum of its proper divisors (7580099).

33212221 is an equidigital number, since it uses as much as digits as its factorization.

33212221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 201 (or 142 counting only the distinct ones).

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

The square root of 33212221 is about 5763.0045115374. The cubic root of 33212221 is about 321.4395462731.

Adding to 33212221 its reverse (12221233), we get a palindrome (45433454).

It can be divided in two parts, 33212 and 221, that added together give a palindrome (33433).

The spelling of 33212221 in words is "thirty-three million, two hundred twelve thousand, two hundred twenty-one".