33028021 has 4 divisors (see below), whose sum is σ = 35568652. Its totient is φ = 30487392.

The previous prime is 33028019. The next prime is 33028027. The reversal of 33028021 is 12082033.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 12082033 = 31 ⋅389743.

It can be written as a sum of positive squares in 2 ways, for example, as 2656900 + 30371121 = 1630^2 + 5511^2 .

It is not a de Polignac number, because 33028021 - 2¹ = 33028019 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 33028021.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (33028027) 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, 1270296 + ... + 1270321.

It is an arithmetic number, because the mean of its divisors is an integer number (8892163).

Almost surely, 2^33028021 is an apocalyptic number.

It is an amenable number.

33028021 is a deficient number, since it is larger than the sum of its proper divisors (2540631).

33028021 is a wasteful number, since it uses less digits than its factorization.

33028021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2540630.

The product of its (nonzero) digits is 288, while the sum is 19.

The square root of 33028021 is about 5747.0010440229. The cubic root of 33028021 is about 320.8441934968.

The spelling of 33028021 in words is "thirty-three million, twenty-eight thousand, twenty-one".