21548704512 has 54 divisors (see below), whose sum is σ = 57361808308. Its totient is φ = 7181545472.

The previous prime is 21548704493. The next prime is 21548704561. The reversal of 21548704512 is 21540784512.

It is a super-2 number, since 2×21548704512² (a number of 21 digits) contains 22 as substring.

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 in 5 ways as a sum of consecutive naturals, for example, 4065448 + ... + 4070744.

Almost surely, 2^21548704512 is an apocalyptic number.

It is an amenable number.

21548704512 is an abundant number, since it is smaller than the sum of its proper divisors (35813103796).

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

21548704512 is an frugal number, since it uses more digits than its factorization.

21548704512 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10613 (or 5302 counting only the distinct ones).

The product of its (nonzero) digits is 89600, while the sum is 39.

The spelling of 21548704512 in words is "twenty-one billion, five hundred forty-eight million, seven hundred four thousand, five hundred twelve".