21563089727 has 8 divisors (see below), whose sum is σ = 21715134000. Its totient is φ = 21411143424.

The previous prime is 21563089703. The next prime is 21563089747. The reversal of 21563089727 is 72798036512.

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 21563089727 - 2¹² = 21563085631 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 (21563089747) 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, 449348 + ... + 495014.

It is an arithmetic number, because the mean of its divisors is an integer number (2714391750).

Almost surely, 2^21563089727 is an apocalyptic number.

21563089727 is a deficient number, since it is larger than the sum of its proper divisors (152044273).

21563089727 is a wasteful number, since it uses less digits than its factorization.

21563089727 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 48985.

The product of its (nonzero) digits is 1270080, while the sum is 50.

The spelling of 21563089727 in words is "twenty-one billion, five hundred sixty-three million, eighty-nine thousand, seven hundred twenty-seven".