21222365563 has 4 divisors (see below), whose sum is σ = 24254132080. Its totient is φ = 18190599048.

The previous prime is 21222365551. The next prime is 21222365587. The reversal of 21222365563 is 36556322212.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21222365563 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21222365543) 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, 1515883248 + ... + 1515883261.

It is an arithmetic number, because the mean of its divisors is an integer number (6063533020).

Almost surely, 2^21222365563 is an apocalyptic number.

21222365563 is a deficient number, since it is larger than the sum of its proper divisors (3031766517).

21222365563 is an equidigital number, since it uses as much as digits as its factorization.

21222365563 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3031766516.

The product of its digits is 129600, while the sum is 37.

Adding to 21222365563 its reverse (36556322212), we get a palindrome (57778687775).

The spelling of 21222365563 in words is "twenty-one billion, two hundred twenty-two million, three hundred sixty-five thousand, five hundred sixty-three".