21033033 has 16 divisors (see below), whose sum is σ = 33156480. Its totient is φ = 11604096.

The previous prime is 21033011. The next prime is 21033053. The reversal of 21033033 is 33033012.

It is not a de Polignac number, because 21033033 - 2⁸ = 21032777 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (21033053) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 16660 + ... + 17877.

It is an arithmetic number, because the mean of its divisors is an integer number (2072280).

Almost surely, 2^21033033 is an apocalyptic number.

It is an amenable number.

21033033 is a deficient number, since it is larger than the sum of its proper divisors (12123447).

21033033 is a wasteful number, since it uses less digits than its factorization.

21033033 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 34576.

The product of its (nonzero) digits is 162, while the sum is 15.

The square root of 21033033 is about 4586.1784745036. The cubic root of 21033033 is about 276.0370014455.

Adding to 21033033 its reverse (33033012), we get a palindrome (54066045).

The spelling of 21033033 in words is "twenty-one million, thirty-three thousand, thirty-three".