33123221 has 4 divisors (see below), whose sum is σ = 34191744. Its totient is φ = 32054700.

The previous prime is 33123217. The next prime is 33123227. The reversal of 33123221 is 12232133.

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 an emirpimes, since its reverse is a distinct semiprime: 12232133 = 107 ⋅114319.

It is a cyclic number.

It is not a de Polignac number, because 33123221 - 2² = 33123217 is a prime.

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 33123221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (33123227) 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, 534215 + ... + 534276.

It is an arithmetic number, because the mean of its divisors is an integer number (8547936).

Almost surely, 2^33123221 is an apocalyptic number.

33123221 is a gapful number since it is divisible by the number (31) formed by its first and last digit.

It is an amenable number.

33123221 is a deficient number, since it is larger than the sum of its proper divisors (1068523).

33123221 is a wasteful number, since it uses less digits than its factorization.

33123221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1068522.

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

The square root of 33123221 is about 5755.2776648916. The cubic root of 33123221 is about 321.1521649926.

Adding to 33123221 its reverse (12232133), we get a palindrome (45355354).

The spelling of 33123221 in words is "thirty-three million, one hundred twenty-three thousand, two hundred twenty-one".