33224021 has 4 divisors (see below), whose sum is σ = 33787200. Its totient is φ = 32660844.

The previous prime is 33224017. The next prime is 33224047. The reversal of 33224021 is 12042233.

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 a cyclic number.

It is not a de Polignac number, because 33224021 - 2² = 33224017 is a prime.

It is a super-2 number, since 2×33224021² = 2207671142816882, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (33224221) 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, 281501 + ... + 281618.

It is an arithmetic number, because the mean of its divisors is an integer number (8446800).

Almost surely, 2^33224021 is an apocalyptic number.

It is an amenable number.

33224021 is a deficient number, since it is larger than the sum of its proper divisors (563179).

33224021 is an equidigital number, since it uses as much as digits as its factorization.

33224021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 563178.

The product of its (nonzero) digits is 288, while the sum is 17.

The square root of 33224021 is about 5764.0281921587. The cubic root of 33224021 is about 321.4776099478.

Adding to 33224021 its reverse (12042233), we get a palindrome (45266254).

The spelling of 33224021 in words is "thirty-three million, two hundred twenty-four thousand, twenty-one".