21530650563565 has 16 divisors (see below), whose sum is σ = 30353700375936. Its totient is φ = 14454143035200.

The previous prime is 21530650563517. The next prime is 21530650563637. The reversal of 21530650563565 is 56536505603512.

It is not a de Polignac number, because 21530650563565 - 2¹¹ = 21530650561517 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 15056398281 + ... + 15056399710.

It is an arithmetic number, because the mean of its divisors is an integer number (1897106273496).

Almost surely, 2^{21530650563565} is an apocalyptic number.

It is an amenable number.

21530650563565 is a deficient number, since it is larger than the sum of its proper divisors (8823049812371).

21530650563565 is a wasteful number, since it uses less digits than its factorization.

21530650563565 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30112798020.

The product of its (nonzero) digits is 12150000, while the sum is 52.

The spelling of 21530650563565 in words is "twenty-one trillion, five hundred thirty billion, six hundred fifty million, five hundred sixty-three thousand, five hundred sixty-five".