21943582408 has 16 divisors (see below), whose sum is σ = 44884600560. Its totient is φ = 9974355600.

The previous prime is 21943582343. The next prime is 21943582471. The reversal of 21943582408 is 80428534912.

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 3 ways as a sum of consecutive naturals, for example, 124679358 + ... + 124679533.

It is an arithmetic number, because the mean of its divisors is an integer number (2805287535).

Almost surely, 2^21943582408 is an apocalyptic number.

It is an amenable number.

21943582408 is an abundant number, since it is smaller than the sum of its proper divisors (22941018152).

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

21943582408 is a wasteful number, since it uses less digits than its factorization.

21943582408 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 249358908 (or 249358904 counting only the distinct ones).

The product of its (nonzero) digits is 552960, while the sum is 46.

The spelling of 21943582408 in words is "twenty-one billion, nine hundred forty-three million, five hundred eighty-two thousand, four hundred eight".