21600736 has 24 divisors (see below), whose sum is σ = 42971040. Its totient is φ = 10687488.

The previous prime is 21600673. The next prime is 21600743. The reversal of 21600736 is 63700612.

It is a self number, because there is not a number n which added to its sum of digits gives 21600736.

It is a congruent number.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 376 + ... + 6583.

It is an arithmetic number, because the mean of its divisors is an integer number (1790460).

Almost surely, 2^21600736 is an apocalyptic number.

It is an amenable number.

21600736 is a deficient number, since it is larger than the sum of its proper divisors (21370304).

21600736 is an equidigital number, since it uses as much as digits as its factorization.

21600736 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7066 (or 7058 counting only the distinct ones).

The product of its (nonzero) digits is 1512, while the sum is 25.

The square root of 21600736 is about 4647.6591957673. The cubic root of 21600736 is about 278.4984931377.

The spelling of 21600736 in words is "twenty-one million, six hundred thousand, seven hundred thirty-six".