21750646856 has 16 divisors (see below), whose sum is σ = 40784265600. Its totient is φ = 10874842704.

The previous prime is 21750646849. The next prime is 21750646861. The reversal of 21750646856 is 65864605712.

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, 196805 + ... + 286763.

It is an arithmetic number, because the mean of its divisors is an integer number (2549016600).

Almost surely, 2^21750646856 is an apocalyptic number.

It is an amenable number.

21750646856 is a deficient number, since it is larger than the sum of its proper divisors (19033618744).

21750646856 is a wasteful number, since it uses less digits than its factorization.

21750646856 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 120188 (or 120184 counting only the distinct ones).

The product of its (nonzero) digits is 2419200, while the sum is 50.

The spelling of 21750646856 in words is "twenty-one billion, seven hundred fifty million, six hundred forty-six thousand, eight hundred fifty-six".