21065284799 has 8 divisors (see below), whose sum is σ = 23467956960. Its totient is φ = 18774364896.

The previous prime is 21065284789. The next prime is 21065284829. The reversal of 21065284799 is 99748256012.

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 21065284799 - 2⁸ = 21065284543 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 21065284799.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21065284789) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 27937667 + ... + 27938420.

It is an arithmetic number, because the mean of its divisors is an integer number (2933494620).

Almost surely, 2^21065284799 is an apocalyptic number.

21065284799 is a gapful number since it is divisible by the number (29) formed by its first and last digit.

21065284799 is a deficient number, since it is larger than the sum of its proper divisors (2402672161).

21065284799 is a wasteful number, since it uses less digits than its factorization.

21065284799 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 55876129.

The product of its (nonzero) digits is 2177280, while the sum is 53.

The spelling of 21065284799 in words is "twenty-one billion, sixty-five million, two hundred eighty-four thousand, seven hundred ninety-nine".