21037024928 has 12 divisors (see below), whose sum is σ = 41416642890. Its totient is φ = 10518512448.

The previous prime is 21037024927. The next prime is 21037024933. The reversal of 21037024928 is 82942073012.

It can be written as a sum of positive squares in only one way, i.e., 20008668304 + 1028356624 = 141452^2 + 32068^2 .

It is a junction number, because it is equal to n+sod(n) for n = 21037024891 and 21037024900.

It is not an unprimeable number, because it can be changed into a prime (21037024927) by changing a digit.

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 as a sum of consecutive naturals, namely, 328703483 + ... + 328703546.

Almost surely, 2^21037024928 is an apocalyptic number.

It is an amenable number.

21037024928 is a deficient number, since it is larger than the sum of its proper divisors (20379617962).

21037024928 is an equidigital number, since it uses as much as digits as its factorization.

21037024928 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 657407039 (or 657407031 counting only the distinct ones).

The product of its (nonzero) digits is 48384, while the sum is 38.

The spelling of 21037024928 in words is "twenty-one billion, thirty-seven million, twenty-four thousand, nine hundred twenty-eight".