21548446848 has 112 divisors (see below), whose sum is σ = 64363654950. Its totient is φ = 7182784512.

The previous prime is 21548446817. The next prime is 21548446861. The reversal of 21548446848 is 84864484512.

21548446848 is a `hidden beast` number, since 2 + 154 + 8 + 446 + 8 + 48 = 666.

It can be written as a sum of positive squares in only one way, i.e., 11804387904 + 9744058944 = 108648^2 + 98712^2 .

It is a super-2 number, since 2×21548446848² (a number of 21 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a junction number, because it is equal to n+sod(n) for n = 21548446794 and 21548446803.

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 13 ways as a sum of consecutive naturals, for example, 22153 + ... + 208776.

Almost surely, 2^21548446848 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21548446848, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (32181827475).

21548446848 is an abundant number, since it is smaller than the sum of its proper divisors (42815208102).

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

21548446848 is an frugal number, since it uses more digits than its factorization.

21548446848 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 230961 (or 230934 counting only the distinct ones).

The product of its digits is 7864320, while the sum is 54.

The spelling of 21548446848 in words is "twenty-one billion, five hundred forty-eight million, four hundred forty-six thousand, eight hundred forty-eight".