21033933928 has 32 divisors (see below), whose sum is σ = 45078168960. Its totient is φ = 9013452480.

The previous prime is 21033933919. The next prime is 21033933931. The reversal of 21033933928 is 82933933012.

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, 590925 + ... + 625507.

It is an arithmetic number, because the mean of its divisors is an integer number (1408692780).

Almost surely, 2^21033933928 is an apocalyptic number.

21033933928 is a gapful number since it is divisible by the number (28) formed by its first and last digit.

It is an amenable number.

21033933928 is an abundant number, since it is smaller than the sum of its proper divisors (24044235032).

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

21033933928 is a wasteful number, since it uses less digits than its factorization.

21033933928 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 45457 (or 45453 counting only the distinct ones).

The product of its (nonzero) digits is 209952, while the sum is 43.

The spelling of 21033933928 in words is "twenty-one billion, thirty-three million, nine hundred thirty-three thousand, nine hundred twenty-eight".