21768333928 has 32 divisors (see below), whose sum is σ = 44866055520. Its totient is φ = 9819160000.

The previous prime is 21768333919. The next prime is 21768333931. The reversal of 21768333928 is 82933386712.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 932623 + ... + 955678.

It is an arithmetic number, because the mean of its divisors is an integer number (1402064235).

Almost surely, 2^21768333928 is an apocalyptic number.

It is an amenable number.

21768333928 is an abundant number, since it is smaller than the sum of its proper divisors (23097721592).

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

21768333928 is a wasteful number, since it uses less digits than its factorization.

21768333928 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1888449 (or 1888445 counting only the distinct ones).

The product of its digits is 2612736, while the sum is 52.

The spelling of 21768333928 in words is "twenty-one billion, seven hundred sixty-eight million, three hundred thirty-three thousand, nine hundred twenty-eight".