21044933 has 16 divisors (see below), whose sum is σ = 26025216. Its totient is φ = 16571520.

The previous prime is 21044927. The next prime is 21044987. The reversal of 21044933 is 33944012.

It is not a de Polignac number, because 21044933 - 2⁴ = 21044917 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21044993) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 25160 + ... + 25982.

It is an arithmetic number, because the mean of its divisors is an integer number (1626576).

Almost surely, 2^21044933 is an apocalyptic number.

It is an amenable number.

21044933 is a deficient number, since it is larger than the sum of its proper divisors (4980283).

21044933 is a wasteful number, since it uses less digits than its factorization.

21044933 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1124.

The product of its (nonzero) digits is 2592, while the sum is 26.

The square root of 21044933 is about 4587.4756675104. The cubic root of 21044933 is about 276.0890500653.

Adding to 21044933 its reverse (33944012), we get a palindrome (54988945).

The spelling of 21044933 in words is "twenty-one million, forty-four thousand, nine hundred thirty-three".