21967793585 has 4 divisors (see below), whose sum is σ = 26361352308. Its totient is φ = 17574234864.

The previous prime is 21967793527. The next prime is 21967793629. The reversal of 21967793585 is 58539776912.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 8668168609 + 13299624976 = 93103^2 + 115324^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21967793585 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2196779354 + ... + 2196779363.

It is an arithmetic number, because the mean of its divisors is an integer number (6590338077).

Almost surely, 2^21967793585 is an apocalyptic number.

It is an amenable number.

21967793585 is a deficient number, since it is larger than the sum of its proper divisors (4393558723).

21967793585 is an equidigital number, since it uses as much as digits as its factorization.

21967793585 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4393558722.

The product of its digits is 28576800, while the sum is 62.

The spelling of 21967793585 in words is "twenty-one billion, nine hundred sixty-seven million, seven hundred ninety-three thousand, five hundred eighty-five".