21603986528 has 12 divisors (see below), whose sum is σ = 42532848540. Its totient is φ = 10801993248.

The previous prime is 21603986519. The next prime is 21603986531. The reversal of 21603986528 is 82568930612.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 337562258 + ... + 337562321.

It is an arithmetic number, because the mean of its divisors is an integer number (3544404045).

Almost surely, 2^21603986528 is an apocalyptic number.

It is an amenable number.

21603986528 is a deficient number, since it is larger than the sum of its proper divisors (20928862012).

21603986528 is an equidigital number, since it uses as much as digits as its factorization.

21603986528 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 675124589 (or 675124581 counting only the distinct ones).

The product of its (nonzero) digits is 1244160, while the sum is 50.

The spelling of 21603986528 in words is "twenty-one billion, six hundred three million, nine hundred eighty-six thousand, five hundred twenty-eight".