21585696 has 48 divisors (see below), whose sum is σ = 61816608. Its totient is φ = 6540800.

The previous prime is 21585677. The next prime is 21585713. The reversal of 21585696 is 69658512.

It is a tau number, because it is divible by the number of its divisors (48).

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 7 ways as a sum of consecutive naturals, for example, 9165 + ... + 11276.

It is an arithmetic number, because the mean of its divisors is an integer number (1287846).

Almost surely, 2^21585696 is an apocalyptic number.

It is an amenable number.

21585696 is an abundant number, since it is smaller than the sum of its proper divisors (40230912).

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

21585696 is a wasteful number, since it uses less digits than its factorization.

21585696 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20465 (or 20457 counting only the distinct ones).

The product of its digits is 129600, while the sum is 42.

The square root of 21585696 is about 4646.0408952139. The cubic root of 21585696 is about 278.4338411762.

The spelling of 21585696 in words is "twenty-one million, five hundred eighty-five thousand, six hundred ninety-six".