21963238563 has 32 divisors (see below), whose sum is σ = 33630681600. Its totient is φ = 12489451776.

The previous prime is 21963238547. The next prime is 21963238589. The reversal of 21963238563 is 36583236912.

It is not a de Polignac number, because 21963238563 - 2⁴ = 21963238547 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21963238963) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 6737628 + ... + 6740886.

It is an arithmetic number, because the mean of its divisors is an integer number (1050958800).

Almost surely, 2^21963238563 is an apocalyptic number.

21963238563 is a deficient number, since it is larger than the sum of its proper divisors (11667443037).

21963238563 is a wasteful number, since it uses less digits than its factorization.

21963238563 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4731.

The product of its digits is 1399680, while the sum is 48.

The spelling of 21963238563 in words is "twenty-one billion, nine hundred sixty-three million, two hundred thirty-eight thousand, five hundred sixty-three".