21753540808 has 32 divisors (see below), whose sum is σ = 40932187200. Its totient is φ = 10838363328.

The previous prime is 21753540793. The next prime is 21753540811. The reversal of 21753540808 is 80804535712.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2757013 + ... + 2764891.

It is an arithmetic number, because the mean of its divisors is an integer number (1279130850).

Almost surely, 2^21753540808 is an apocalyptic number.

It is an amenable number.

21753540808 is a deficient number, since it is larger than the sum of its proper divisors (19178646392).

21753540808 is a wasteful number, since it uses less digits than its factorization.

21753540808 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9061 (or 9057 counting only the distinct ones).

The product of its (nonzero) digits is 268800, while the sum is 43.

The spelling of 21753540808 in words is "twenty-one billion, seven hundred fifty-three million, five hundred forty thousand, eight hundred eight".