21304833 has 24 divisors (see below), whose sum is σ = 32877600. Its totient is φ = 12228480.

The previous prime is 21304817. The next prime is 21304847. The reversal of 21304833 is 33840312.

It is not a de Polignac number, because 21304833 - 2⁴ = 21304817 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21304873) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 5353 + ... + 8441.

It is an arithmetic number, because the mean of its divisors is an integer number (1369900).

Almost surely, 2^21304833 is an apocalyptic number.

It is an amenable number.

21304833 is a deficient number, since it is larger than the sum of its proper divisors (11572767).

21304833 is a wasteful number, since it uses less digits than its factorization.

21304833 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3133 (or 3122 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 24.

The square root of 21304833 is about 4615.7158708049. The cubic root of 21304833 is about 277.2209482783.

The spelling of 21304833 in words is "twenty-one million, three hundred four thousand, eight hundred thirty-three".