33221321 has 4 divisors (see below), whose sum is σ = 37967232. Its totient is φ = 28475412.

The previous prime is 33221263. The next prime is 33221323. The reversal of 33221321 is 12312233.

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.

It is not a de Polignac number, because 33221321 - 2²² = 29027017 is a prime.

It is a super-2 number, since 2×33221321² = 2207312337970082, which contains 22 as substring.

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 33221321.

It is not an unprimeable number, because it can be changed into a prime (33221323) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2372945 + ... + 2372958.

It is an arithmetic number, because the mean of its divisors is an integer number (9491808).

Almost surely, 2^33221321 is an apocalyptic number.

It is an amenable number.

33221321 is a deficient number, since it is larger than the sum of its proper divisors (4745911).

33221321 is an equidigital number, since it uses as much as digits as its factorization.

33221321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4745910.

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

The square root of 33221321 is about 5763.7939761931. The cubic root of 33221321 is about 321.4689012582.

Adding to 33221321 its reverse (12312233), we get a palindrome (45533554).

The spelling of 33221321 in words is "thirty-three million, two hundred twenty-one thousand, three hundred twenty-one".