21567389448 has 96 divisors (see below), whose sum is σ = 59312594880. Its totient is φ = 6530409600.

The previous prime is 21567389423. The next prime is 21567389477. The reversal of 21567389448 is 84498376512.

It is a happy number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 5361678 + ... + 5365698.

It is an arithmetic number, because the mean of its divisors is an integer number (617839530).

Almost surely, 2^21567389448 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 21567389448, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (29656297440).

21567389448 is an abundant number, since it is smaller than the sum of its proper divisors (37745205432).

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

21567389448 is a wasteful number, since it uses less digits than its factorization.

21567389448 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5899 (or 5884 counting only the distinct ones).

The product of its digits is 11612160, while the sum is 57.

The spelling of 21567389448 in words is "twenty-one billion, five hundred sixty-seven million, three hundred eighty-nine thousand, four hundred forty-eight".