21348311585 has 8 divisors (see below), whose sum is σ = 25766055720. Its totient is φ = 16979928064.

The previous prime is 21348311573. The next prime is 21348311623. The reversal of 21348311585 is 58511384312.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 10622188096 + 10726123489 = 103064^2 + 103567^2 .

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 21348311585 - 2⁸ = 21348311329 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 12339200 + ... + 12340929.

It is an arithmetic number, because the mean of its divisors is an integer number (3220756965).

Almost surely, 2^21348311585 is an apocalyptic number.

It is an amenable number.

21348311585 is a deficient number, since it is larger than the sum of its proper divisors (4417744135).

21348311585 is a wasteful number, since it uses less digits than its factorization.

21348311585 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24680307.

The product of its digits is 115200, while the sum is 41.

Adding to 21348311585 its reverse (58511384312), we get a palindrome (79859695897).

The spelling of 21348311585 in words is "twenty-one billion, three hundred forty-eight million, three hundred eleven thousand, five hundred eighty-five".