21943586872 has 16 divisors (see below), whose sum is σ = 41159986560. Its totient is φ = 10967590464.

The previous prime is 21943586867. The next prime is 21943586897. The reversal of 21943586872 is 27868534912.

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, 503128 + ... + 544999.

It is an arithmetic number, because the mean of its divisors is an integer number (2572499160).

Almost surely, 2^21943586872 is an apocalyptic number.

It is an amenable number.

21943586872 is a deficient number, since it is larger than the sum of its proper divisors (19216399688).

21943586872 is a wasteful number, since it uses less digits than its factorization.

21943586872 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1050750 (or 1050746 counting only the distinct ones).

The product of its digits is 5806080, while the sum is 55.

The spelling of 21943586872 in words is "twenty-one billion, nine hundred forty-three million, five hundred eighty-six thousand, eight hundred seventy-two".