21648547180 has 48 divisors (see below), whose sum is σ = 51535824480. Its totient is φ = 7572607488.

The previous prime is 21648547171. The next prime is 21648547181. The reversal of 21648547180 is 8174584612.

It is a self number, because there is not a number n which added to its sum of digits gives 21648547180.

It is not an unprimeable number, because it can be changed into a prime (21648547181) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2186209 + ... + 2196088.

It is an arithmetic number, because the mean of its divisors is an integer number (1073663010).

Almost surely, 2^21648547180 is an apocalyptic number.

21648547180 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21648547180 is an abundant number, since it is smaller than the sum of its proper divisors (29887277300).

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

21648547180 is a wasteful number, since it uses less digits than its factorization.

21648547180 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4382338 (or 4382336 counting only the distinct ones).

The product of its (nonzero) digits is 430080, while the sum is 46.

The spelling of 21648547180 in words is "twenty-one billion, six hundred forty-eight million, five hundred forty-seven thousand, one hundred eighty".