33807021 has 4 divisors (see below), whose sum is σ = 45076032. Its totient is φ = 22538012.

The previous prime is 33807017. The next prime is 33807029. The reversal of 33807021 is 12070833.

33807021 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 33807021 - 2² = 33807017 is a prime.

It is a super-2 number, since 2×33807021² = 2285829337788882, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 33806982 and 33807000.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (33807029) 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, 5634501 + ... + 5634506.

It is an arithmetic number, because the mean of its divisors is an integer number (11269008).

Almost surely, 2^33807021 is an apocalyptic number.

It is an amenable number.

33807021 is a deficient number, since it is larger than the sum of its proper divisors (11269011).

33807021 is a wasteful number, since it uses less digits than its factorization.

33807021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11269010.

The product of its (nonzero) digits is 1008, while the sum is 24.

The square root of 33807021 is about 5814.3805345024. The cubic root of 33807021 is about 323.3470981729.

Adding to 33807021 its reverse (12070833), we get a palindrome (45877854).

It can be divided in two parts, 3380 and 7021, that added together give a palindrome (10401).

The spelling of 33807021 in words is "thirty-three million, eight hundred seven thousand, twenty-one".