21543548592 has 40 divisors (see below), whose sum is σ = 56416562224. Its totient is φ = 7082809344.

The previous prime is 21543548591. The next prime is 21543548603. The reversal of 21543548592 is 29584534512.

It is a Harshad number since it is a multiple of its sum of digits (48).

It is not an unprimeable number, because it can be changed into a prime (21543548591) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3070633 + ... + 3077640.

Almost surely, 2^21543548592 is an apocalyptic number.

It is an amenable number.

21543548592 is an abundant number, since it is smaller than the sum of its proper divisors (34873013632).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21543548592 is a wasteful number, since it uses less digits than its factorization.

21543548592 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6148357 (or 6148351 counting only the distinct ones).

The product of its digits is 1728000, while the sum is 48.

The spelling of 21543548592 in words is "twenty-one billion, five hundred forty-three million, five hundred forty-eight thousand, five hundred ninety-two".