21945072048 has 80 divisors (see below), whose sum is σ = 59757782400. Its totient is φ = 6920432640.

The previous prime is 21945071987. The next prime is 21945072049. The reversal of 21945072048 is 84027054912.

It is not an unprimeable number, because it can be changed into a prime (21945072049) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 657688 + ... + 690248.

It is an arithmetic number, because the mean of its divisors is an integer number (746972280).

Almost surely, 2^21945072048 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 21945072048, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (29878891200).

21945072048 is an abundant number, since it is smaller than the sum of its proper divisors (37812710352).

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

21945072048 is a wasteful number, since it uses less digits than its factorization.

21945072048 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33330 (or 33324 counting only the distinct ones).

The product of its (nonzero) digits is 161280, while the sum is 42.

The spelling of 21945072048 in words is "twenty-one billion, nine hundred forty-five million, seventy-two thousand, forty-eight".