21242016563 has 4 divisors (see below), whose sum is σ = 21256303200. Its totient is φ = 21227729928.

The previous prime is 21242016559. The next prime is 21242016569. The reversal of 21242016563 is 36561024212.

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 21242016563 - 2² = 21242016559 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21242016569) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7141088 + ... + 7144061.

It is an arithmetic number, because the mean of its divisors is an integer number (5314075800).

Almost surely, 2^21242016563 is an apocalyptic number.

21242016563 is a deficient number, since it is larger than the sum of its proper divisors (14286637).

21242016563 is a wasteful number, since it uses less digits than its factorization.

21242016563 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14286636.

The product of its (nonzero) digits is 17280, while the sum is 32.

The spelling of 21242016563 in words is "twenty-one billion, two hundred forty-two million, sixteen thousand, five hundred sixty-three".