21044033 has 4 divisors (see below), whose sum is σ = 21248448. Its totient is φ = 20839620.

The previous prime is 21044003. The next prime is 21044047. The reversal of 21044033 is 33044012.

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 21044033 - 2¹⁴ = 21027649 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21044003) 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, 102053 + ... + 102258.

It is an arithmetic number, because the mean of its divisors is an integer number (5312112).

Almost surely, 2^21044033 is an apocalyptic number.

It is an amenable number.

21044033 is a deficient number, since it is larger than the sum of its proper divisors (204415).

21044033 is a wasteful number, since it uses less digits than its factorization.

21044033 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 204414.

The product of its (nonzero) digits is 288, while the sum is 17.

The square root of 21044033 is about 4587.3775732983. The cubic root of 21044033 is about 276.0851143010.

Adding to 21044033 its reverse (33044012), we get a palindrome (54088045).

The spelling of 21044033 in words is "twenty-one million, forty-four thousand, thirty-three".