21675008928 has 48 divisors (see below), whose sum is σ = 57312239040. Its totient is φ = 7172261376.

The previous prime is 21675008923. The next prime is 21675008933. The reversal of 21675008928 is 82980057612.

It is an interprime number because it is at equal distance from previous prime (21675008923) and next prime (21675008933).

It is a tau number, because it is divible by the number of its divisors (48).

It is a Harshad number since it is a multiple of its sum of digits (48).

It is not an unprimeable number, because it can be changed into a prime (21675008923) 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 in 7 ways as a sum of consecutive naturals, for example, 810868 + ... + 837171.

It is an arithmetic number, because the mean of its divisors is an integer number (1194004980).

Almost surely, 2^21675008928 is an apocalyptic number.

It is an amenable number.

21675008928 is an abundant number, since it is smaller than the sum of its proper divisors (35637230112).

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

21675008928 is a wasteful number, since it uses less digits than its factorization.

21675008928 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1648189 (or 1648181 counting only the distinct ones).

The product of its (nonzero) digits is 483840, while the sum is 48.

The spelling of 21675008928 in words is "twenty-one billion, six hundred seventy-five million, eight thousand, nine hundred twenty-eight".