21582775448 has 16 divisors (see below), whose sum is σ = 43580604480. Its totient is φ = 9961280928.

The previous prime is 21582775421. The next prime is 21582775477. The reversal of 21582775448 is 84457728512.

It is a Smith number, since the sum of its digits (53) coincides with the sum of the digits of its prime factors.

It is a self number, because there is not a number n which added to its sum of digits gives 21582775448.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 103763240 + ... + 103763447.

It is an arithmetic number, because the mean of its divisors is an integer number (2723787780).

Almost surely, 2^21582775448 is an apocalyptic number.

It is an amenable number.

21582775448 is an abundant number, since it is smaller than the sum of its proper divisors (21997829032).

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

21582775448 is a wasteful number, since it uses less digits than its factorization.

21582775448 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 207526706 (or 207526702 counting only the distinct ones).

The product of its digits is 5017600, while the sum is 53.

The spelling of 21582775448 in words is "twenty-one billion, five hundred eighty-two million, seven hundred seventy-five thousand, four hundred forty-eight".