33321221 has 4 divisors (see below), whose sum is σ = 33644832. Its totient is φ = 32997612.

The previous prime is 33321199. The next prime is 33321229. The reversal of 33321221 is 12212333.

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 33321221 - 2²² = 29126917 is a prime.

It is a super-2 number, since 2×33321221² = 2220607537861682, 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 33321221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (33321229) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 161651 + ... + 161856.

It is an arithmetic number, because the mean of its divisors is an integer number (8411208).

Almost surely, 2^33321221 is an apocalyptic number.

It is an amenable number.

33321221 is a deficient number, since it is larger than the sum of its proper divisors (323611).

33321221 is a wasteful number, since it uses less digits than its factorization.

33321221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 323610.

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

The square root of 33321221 is about 5772.4536377523. The cubic root of 33321221 is about 321.7908090485.

Adding to 33321221 its reverse (12212333), we get a palindrome (45533554).

The spelling of 33321221 in words is "thirty-three million, three hundred twenty-one thousand, two hundred twenty-one".