21548484567 has 16 divisors (see below), whose sum is σ = 31926535680. Its totient is φ = 14364371736.

The previous prime is 21548484563. The next prime is 21548484647. The reversal of 21548484567 is 76548484512.

21548484567 is a `hidden beast` number, since 2 + 1 + 548 + 48 + 4 + 56 + 7 = 666.

It is not a de Polignac number, because 21548484567 - 2² = 21548484563 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21548484563) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 346098 + ... + 403584.

It is an arithmetic number, because the mean of its divisors is an integer number (1995408480).

Almost surely, 2^21548484567 is an apocalyptic number.

21548484567 is a gapful number since it is divisible by the number (27) formed by its first and last digit.

21548484567 is a deficient number, since it is larger than the sum of its proper divisors (10378051113).

21548484567 is a wasteful number, since it uses less digits than its factorization.

21548484567 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 71379 (or 71373 counting only the distinct ones).

The product of its digits is 8601600, while the sum is 54.

Subtracting 21548484567 from its reverse (76548484512), we obtain a palindrome (54999999945).

The spelling of 21548484567 in words is "twenty-one billion, five hundred forty-eight million, four hundred eighty-four thousand, five hundred sixty-seven".