21044233 has 16 divisors (see below), whose sum is σ = 24748416. Its totient is φ = 17521920.

The previous prime is 21044213. The next prime is 21044237. The reversal of 21044233 is 33244012.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21044233 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21044233.

It is not an unprimeable number, because it can be changed into a prime (21044237) 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, 48385 + ... + 48817.

It is an arithmetic number, because the mean of its divisors is an integer number (1546776).

Almost surely, 2^21044233 is an apocalyptic number.

It is an amenable number.

21044233 is a deficient number, since it is larger than the sum of its proper divisors (3704183).

21044233 is a wasteful number, since it uses less digits than its factorization.

21044233 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 624.

The product of its (nonzero) digits is 576, while the sum is 19.

The square root of 21044233 is about 4587.3993721934. The cubic root of 21044233 is about 276.0859889250.

Adding to 21044233 its reverse (33244012), we get a palindrome (54288245).

The spelling of 21044233 in words is "twenty-one million, forty-four thousand, two hundred thirty-three".