21473839563 has 8 divisors (see below), whose sum is σ = 31234675776. Its totient is φ = 13014448200.

The previous prime is 21473839553. The next prime is 21473839567. The reversal of 21473839563 is 36593837412.

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

It is not a de Polignac number, because 21473839563 - 2⁸ = 21473839307 is a prime.

It is a super-2 number, since 2×21473839563² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21473839567) 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, 325361173 + ... + 325361238.

It is an arithmetic number, because the mean of its divisors is an integer number (3904334472).

Almost surely, 2^21473839563 is an apocalyptic number.

21473839563 is a deficient number, since it is larger than the sum of its proper divisors (9760836213).

21473839563 is a wasteful number, since it uses less digits than its factorization.

21473839563 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 650722425.

The product of its digits is 3265920, while the sum is 51.

The spelling of 21473839563 in words is "twenty-one billion, four hundred seventy-three million, eight hundred thirty-nine thousand, five hundred sixty-three".