21845448576 has 480 divisors, whose sum is σ = 77806436400. Its totient is φ = 5959692288.

The previous prime is 21845448571. The next prime is 21845448577. The reversal of 21845448576 is 67584454812.

21845448576 is a `hidden beast` number, since 2 + 18 + 4 + 54 + 4 + 8 + 576 = 666.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21845448571) by changing a digit.

It is a polite number, since it can be written in 59 ways as a sum of consecutive naturals, for example, 38392420 + ... + 38392988.

Almost surely, 2^21845448576 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 21845448576, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (38903218200).

21845448576 is an abundant number, since it is smaller than the sum of its proper divisors (55960987824).

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

21845448576 is an equidigital number, since it uses as much as digits as its factorization.

21845448576 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 648 (or 604 counting only the distinct ones).

The product of its digits is 8601600, while the sum is 54.

The spelling of 21845448576 in words is "twenty-one billion, eight hundred forty-five million, four hundred forty-eight thousand, five hundred seventy-six".