21441422563 has 4 divisors (see below), whose sum is σ = 23390642808. Its totient is φ = 19492202320.

The previous prime is 21441422507. The next prime is 21441422593. The reversal of 21441422563 is 36522414412.

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-21441422563 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21441422593) 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, 974610106 + ... + 974610127.

It is an arithmetic number, because the mean of its divisors is an integer number (5847660702).

Almost surely, 2^21441422563 is an apocalyptic number.

21441422563 is a deficient number, since it is larger than the sum of its proper divisors (1949220245).

21441422563 is a wasteful number, since it uses less digits than its factorization.

21441422563 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1949220244.

The product of its digits is 46080, while the sum is 34.

Adding to 21441422563 its reverse (36522414412), we get a palindrome (57963836975).

The spelling of 21441422563 in words is "twenty-one billion, four hundred forty-one million, four hundred twenty-two thousand, five hundred sixty-three".