21504240512 has 16 divisors (see below), whose sum is σ = 42840479400. Its totient is φ = 10752120192.

The previous prime is 21504240503. The next prime is 21504240607.

21504240512 is nontrivially palindromic in base 10.

It is a tau number, because it is divible by the number of its divisors (16).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 84000812 + ... + 84001067.

Almost surely, 2^21504240512 is an apocalyptic number.

It is an amenable number.

21504240512 is a deficient number, since it is larger than the sum of its proper divisors (21336238888).

21504240512 is an equidigital number, since it uses as much as digits as its factorization.

21504240512 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 168001893 (or 168001881 counting only the distinct ones).

The product of its (nonzero) digits is 3200, while the sum is 26.

The spelling of 21504240512 in words is "twenty-one billion, five hundred four million, two hundred forty thousand, five hundred twelve".