21208813593 has 32 divisors (see below), whose sum is σ = 32496921600. Its totient is φ = 12168273600.

The previous prime is 21208813541. The next prime is 21208813601. The reversal of 21208813593 is 39531880212.

It is a happy number.

It is not a de Polignac number, because 21208813593 - 2⁹ = 21208813081 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21208813523) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 884148 + ... + 907818.

It is an arithmetic number, because the mean of its divisors is an integer number (1015528800).

Almost surely, 2^21208813593 is an apocalyptic number.

It is an amenable number.

21208813593 is a deficient number, since it is larger than the sum of its proper divisors (11288108007).

21208813593 is a wasteful number, since it uses less digits than its factorization.

21208813593 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25133.

The product of its (nonzero) digits is 103680, while the sum is 42.

The spelling of 21208813593 in words is "twenty-one billion, two hundred eight million, eight hundred thirteen thousand, five hundred ninety-three".