21004833 has 16 divisors (see below), whose sum is σ = 28828800. Its totient is φ = 13595520.

The previous prime is 21004831. The next prime is 21004847. The reversal of 21004833 is 33840012.

It is a happy number.

It is not a de Polignac number, because 21004833 - 2¹ = 21004831 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21004831) 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, 47628 + ... + 48066.

It is an arithmetic number, because the mean of its divisors is an integer number (1801800).

Almost surely, 2^21004833 is an apocalyptic number.

It is an amenable number.

21004833 is a deficient number, since it is larger than the sum of its proper divisors (7823967).

21004833 is a wasteful number, since it uses less digits than its factorization.

21004833 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 872.

The product of its (nonzero) digits is 576, while the sum is 21.

The square root of 21004833 is about 4583.1029881511. The cubic root of 21004833 is about 275.9135809044.

Adding to 21004833 its reverse (33840012), we get a palindrome (54844845).

The spelling of 21004833 in words is "twenty-one million, four thousand, eight hundred thirty-three".