33228021 has 4 divisors (see below), whose sum is σ = 44304032. Its totient is φ = 22152012.

The previous prime is 33228011. The next prime is 33228037. The reversal of 33228021 is 12082233.

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 not a de Polignac number, because 33228021 - 2¹⁰ = 33226997 is a prime.

It is a super-2 number, since 2×33228021² = 2208202759152882, 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 (33228011) 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, 5538001 + ... + 5538006.

It is an arithmetic number, because the mean of its divisors is an integer number (11076008).

Almost surely, 2^33228021 is an apocalyptic number.

It is an amenable number.

33228021 is a deficient number, since it is larger than the sum of its proper divisors (11076011).

33228021 is a wasteful number, since it uses less digits than its factorization.

33228021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11076010.

The product of its (nonzero) digits is 576, while the sum is 21.

The square root of 33228021 is about 5764.3751612816. The cubic root of 33228021 is about 321.4905108430.

The spelling of 33228021 in words is "thirty-three million, two hundred twenty-eight thousand, twenty-one".