21824564799 has 4 divisors (see below), whose sum is σ = 29099419736. Its totient is φ = 14549709864.

The previous prime is 21824564779. The next prime is 21824564813. The reversal of 21824564799 is 99746542812.

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

It is not a de Polignac number, because 21824564799 - 2⁹ = 21824564287 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21824564779) by changing a digit.

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, 3637427464 + ... + 3637427469.

It is an arithmetic number, because the mean of its divisors is an integer number (7274854934).

Almost surely, 2^21824564799 is an apocalyptic number.

21824564799 is a deficient number, since it is larger than the sum of its proper divisors (7274854937).

21824564799 is an equidigital number, since it uses as much as digits as its factorization.

21824564799 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7274854936.

The product of its digits is 8709120, while the sum is 57.

The spelling of 21824564799 in words is "twenty-one billion, eight hundred twenty-four million, five hundred sixty-four thousand, seven hundred ninety-nine".