33564221 has 4 divisors (see below), whose sum is σ = 33576192. Its totient is φ = 33552252.

The previous prime is 33564197. The next prime is 33564229. The reversal of 33564221 is 12246533.

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 a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 12246533 = 13 ⋅942041.

It is a cyclic number.

It is not a de Polignac number, because 33564221 - 2¹⁰ = 33563197 is a prime.

It is a super-2 number, since 2×33564221² = 2253113862673682, 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 (33564229) 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, 740 + ... + 8226.

It is an arithmetic number, because the mean of its divisors is an integer number (8394048).

Almost surely, 2^33564221 is an apocalyptic number.

It is an amenable number.

33564221 is a deficient number, since it is larger than the sum of its proper divisors (11971).

33564221 is an equidigital number, since it uses as much as digits as its factorization.

33564221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11970.

The product of its digits is 4320, while the sum is 26.

The square root of 33564221 is about 5793.4636444876. The cubic root of 33564221 is about 322.5711510981.

The spelling of 33564221 in words is "thirty-three million, five hundred sixty-four thousand, two hundred twenty-one".