33040021 has 4 divisors (see below), whose sum is σ = 37760032. Its totient is φ = 28320012.

The previous prime is 33040009. The next prime is 33040057. The reversal of 33040021 is 12004033.

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 33040021 - 2²¹ = 30942869 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 33039983 and 33040010.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (33040081) 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, 2359995 + ... + 2360008.

It is an arithmetic number, because the mean of its divisors is an integer number (9440008).

Almost surely, 2^33040021 is an apocalyptic number.

It is an amenable number.

33040021 is a deficient number, since it is larger than the sum of its proper divisors (4720011).

33040021 is an equidigital number, since it uses as much as digits as its factorization.

33040021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4720010.

The product of its (nonzero) digits is 72, while the sum is 13.

The square root of 33040021 is about 5748.0449719883. The cubic root of 33040021 is about 320.8830460026.

Adding to 33040021 its reverse (12004033), we get a palindrome (45044054).

The spelling of 33040021 in words is "thirty-three million, forty thousand, twenty-one".