21300824 has 32 divisors (see below), whose sum is σ = 43032000. Its totient is φ = 9852192.

The previous prime is 21300791. The next prime is 21300833. The reversal of 21300824 is 42800312.

It is a junction number, because it is equal to n+sod(n) for n = 21300796 and 21300805.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4907 + ... + 8165.

It is an arithmetic number, because the mean of its divisors is an integer number (1344750).

Almost surely, 2^21300824 is an apocalyptic number.

It is an amenable number.

21300824 is an abundant number, since it is smaller than the sum of its proper divisors (21731176).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21300824 is a wasteful number, since it uses less digits than its factorization.

21300824 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3327 (or 3323 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 20.

The square root of 21300824 is about 4615.2815732087. The cubic root of 21300824 is about 277.2035586638.

The spelling of 21300824 in words is "twenty-one million, three hundred thousand, eight hundred twenty-four".