21288585 has 8 divisors (see below), whose sum is σ = 34061760. Its totient is φ = 11353904.

The previous prime is 21288577. The next prime is 21288601. The reversal of 21288585 is 58588212.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 21288585 - 2³ = 21288577 is a prime.

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, 709605 + ... + 709634.

It is an arithmetic number, because the mean of its divisors is an integer number (4257720).

Almost surely, 2^21288585 is an apocalyptic number.

It is an amenable number.

21288585 is a deficient number, since it is larger than the sum of its proper divisors (12773175).

21288585 is a wasteful number, since it uses less digits than its factorization.

21288585 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1419247.

The product of its digits is 51200, while the sum is 39.

The square root of 21288585 is about 4613.9554614235. The cubic root of 21288585 is about 277.1504567376.

The spelling of 21288585 in words is "twenty-one million, two hundred eighty-eight thousand, five hundred eighty-five".