21342441563 has 8 divisors (see below), whose sum is σ = 22599839808. Its totient is φ = 20085261184.

The previous prime is 21342441559. The next prime is 21342441577. The reversal of 21342441563 is 36514424312.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 21342441563 - 2² = 21342441559 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21342441583) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 174845 + ... + 270657.

It is an arithmetic number, because the mean of its divisors is an integer number (2824979976).

Almost surely, 2^21342441563 is an apocalyptic number.

21342441563 is a deficient number, since it is larger than the sum of its proper divisors (1257398245).

21342441563 is a wasteful number, since it uses less digits than its factorization.

21342441563 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 108933.

The product of its digits is 69120, while the sum is 35.

Adding to 21342441563 its reverse (36514424312), we get a palindrome (57856865875).

The spelling of 21342441563 in words is "twenty-one billion, three hundred forty-two million, four hundred forty-one thousand, five hundred sixty-three".