21044608759 has 4 divisors (see below), whose sum is σ = 21046407160. Its totient is φ = 21042810360.

The previous prime is 21044608723. The next prime is 21044608769. The reversal of 21044608759 is 95780644012.

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

It is a cyclic number.

It is not a de Polignac number, because 21044608759 - 2⁷ = 21044608631 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 (21044608769) 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 3 ways as a sum of consecutive naturals, for example, 881532 + ... + 905089.

It is an arithmetic number, because the mean of its divisors is an integer number (5261601790).

Almost surely, 2^21044608759 is an apocalyptic number.

21044608759 is a deficient number, since it is larger than the sum of its proper divisors (1798401).

21044608759 is a wasteful number, since it uses less digits than its factorization.

21044608759 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1798400.

The product of its (nonzero) digits is 483840, while the sum is 46.

The spelling of 21044608759 in words is "twenty-one billion, forty-four million, six hundred eight thousand, seven hundred fifty-nine".