21943582320 has 240 divisors, whose sum is σ = 79171495200. Its totient is φ = 5006622720.

The previous prime is 21943582319. The next prime is 21943582343. The reversal of 21943582320 is 2328534912.

It is a tau number, because it is divible by the number of its divisors (240).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 471456 + ... + 515904.

It is an arithmetic number, because the mean of its divisors is an integer number (329881230).

Almost surely, 2^21943582320 is an apocalyptic number.

21943582320 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21943582320, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (39585747600).

21943582320 is an abundant number, since it is smaller than the sum of its proper divisors (57227912880).

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

21943582320 is a wasteful number, since it uses less digits than its factorization.

21943582320 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 44504 (or 44487 counting only the distinct ones).

The product of its (nonzero) digits is 103680, while the sum is 39.

The spelling of 21943582320 in words is "twenty-one billion, nine hundred forty-three million, five hundred eighty-two thousand, three hundred twenty".