21099599585 has 8 divisors (see below), whose sum is σ = 26420368320. Its totient is φ = 16145780464.

The previous prime is 21099599531. The next prime is 21099599593. The reversal of 21099599585 is 58599599012.

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 21099599585 - 2²⁸ = 20831164129 is a prime.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 91737275 + ... + 91737504.

It is an arithmetic number, because the mean of its divisors is an integer number (3302546040).

Almost surely, 2^21099599585 is an apocalyptic number.

It is an amenable number.

21099599585 is a deficient number, since it is larger than the sum of its proper divisors (5320768735).

21099599585 is a wasteful number, since it uses less digits than its factorization.

21099599585 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 183474807.

The product of its (nonzero) digits is 13122000, while the sum is 62.

The spelling of 21099599585 in words is "twenty-one billion, ninety-nine million, five hundred ninety-nine thousand, five hundred eighty-five".