33132221 has 4 divisors (see below), whose sum is σ = 33598944. Its totient is φ = 32665500.

The previous prime is 33132163. The next prime is 33132241. The reversal of 33132221 is 12223133.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 12223133 = 13 ⋅940241.

It is a cyclic number.

It is not a de Polignac number, because 33132221 - 2¹⁸ = 32870077 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 33132221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (33132241) 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 3 ways as a sum of consecutive naturals, for example, 233255 + ... + 233396.

It is an arithmetic number, because the mean of its divisors is an integer number (8399736).

Almost surely, 2^33132221 is an apocalyptic number.

It is an amenable number.

33132221 is a deficient number, since it is larger than the sum of its proper divisors (466723).

33132221 is an equidigital number, since it uses as much as digits as its factorization.

33132221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 466722.

The product of its digits is 216, while the sum is 17.

The square root of 33132221 is about 5756.0595028196. The cubic root of 33132221 is about 321.1812493998.

Adding to 33132221 its reverse (12223133), we get a palindrome (45355354).

The spelling of 33132221 in words is "thirty-three million, one hundred thirty-two thousand, two hundred twenty-one".