21336033 has 4 divisors (see below), whose sum is σ = 28448048. Its totient is φ = 14224020.

The previous prime is 21336017. The next prime is 21336047. The reversal of 21336033 is 33063312.

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 21336033 - 2⁴ = 21336017 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (21336233) 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, 3556003 + ... + 3556008.

It is an arithmetic number, because the mean of its divisors is an integer number (7112012).

Almost surely, 2^21336033 is an apocalyptic number.

It is an amenable number.

21336033 is a deficient number, since it is larger than the sum of its proper divisors (7112015).

21336033 is an equidigital number, since it uses as much as digits as its factorization.

21336033 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7112014.

The product of its (nonzero) digits is 972, while the sum is 21.

The square root of 21336033 is about 4619.0943917612. The cubic root of 21336033 is about 277.3562082738.

Adding to 21336033 its reverse (33063312), we get a palindrome (54399345).

The spelling of 21336033 in words is "twenty-one million, three hundred thirty-six thousand, thirty-three".