33221 has 4 divisors (see below), whose sum is σ = 33600. Its totient is φ = 32844.

The previous prime is 33211. The next prime is 33223. The reversal of 33221 is 12233.

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: 12233 = 13 ⋅941.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-33221 is a prime.

It is a super-2 number, since 2×33221² = 2207269682, which contains 22 as substring.

It is a d-powerful number, because it can be written as 3⁴ + 3⁵ + 2⁷ + 2¹⁵ + 1 .

It is a Duffinian number.

It is a nialpdrome in base 10.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (33223) 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, 20 + ... + 258.

It is an arithmetic number, because the mean of its divisors is an integer number (8400).

2³³²²¹ is an apocalyptic number.

It is an amenable number.

33221 is a deficient number, since it is larger than the sum of its proper divisors (379).

33221 is a wasteful number, since it uses less digits than its factorization.

33221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 378.

The product of its digits is 36, while the sum is 11.

The square root of 33221 is about 182.2662887097. The cubic root of 33221 is about 32.1467865860.

Adding to 33221 its reverse (12233), we get a palindrome (45454).

It can be divided in two parts, 332 and 21, that added together give a palindrome (353).

The spelling of 33221 in words is "thirty-three thousand, two hundred twenty-one".