21322440563 has 4 divisors (see below), whose sum is σ = 21345847008. Its totient is φ = 21299034120.

The previous prime is 21322440551. The next prime is 21322440619. The reversal of 21322440563 is 36504422312.

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 21322440563 - 2¹⁶ = 21322375027 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21322440463) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11701856 + ... + 11703677.

It is an arithmetic number, because the mean of its divisors is an integer number (5336461752).

Almost surely, 2^21322440563 is an apocalyptic number.

21322440563 is a deficient number, since it is larger than the sum of its proper divisors (23406445).

21322440563 is an equidigital number, since it uses as much as digits as its factorization.

21322440563 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23406444.

The product of its (nonzero) digits is 34560, while the sum is 32.

Adding to 21322440563 its reverse (36504422312), we get a palindrome (57826862875).

The spelling of 21322440563 in words is "twenty-one billion, three hundred twenty-two million, four hundred forty thousand, five hundred sixty-three".