21456759559 has 8 divisors (see below), whose sum is σ = 23273042688. Its totient is φ = 19702045440.

The previous prime is 21456759497. The next prime is 21456759589. The reversal of 21456759559 is 95595765412.

It is a happy number.

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 21456759559 - 2⁷ = 21456759431 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 (21456759589) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 15391527 + ... + 15392920.

It is an arithmetic number, because the mean of its divisors is an integer number (2909130336).

Almost surely, 2^21456759559 is an apocalyptic number.

21456759559 is a deficient number, since it is larger than the sum of its proper divisors (1816283129).

21456759559 is a wasteful number, since it uses less digits than its factorization.

21456759559 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30784505.

The product of its digits is 17010000, while the sum is 58.

The spelling of 21456759559 in words is "twenty-one billion, four hundred fifty-six million, seven hundred fifty-nine thousand, five hundred fifty-nine".