21423708825508 has 48 divisors (see below), whose sum is σ = 43015744396800. Its totient is φ = 9246109017600.

The previous prime is 21423708825487. The next prime is 21423708825521. The reversal of 21423708825508 is 80552880732412.

It is a happy number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 148102533 + ... + 148247116.

It is an arithmetic number, because the mean of its divisors is an integer number (896161341600).

Almost surely, 2^{21423708825508} is an apocalyptic number.

It is an amenable number.

21423708825508 is an abundant number, since it is smaller than the sum of its proper divisors (21592035571292).

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

21423708825508 is a wasteful number, since it uses less digits than its factorization.

21423708825508 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 296349748 (or 296349746 counting only the distinct ones).

The product of its (nonzero) digits is 8601600, while the sum is 55.

The spelling of 21423708825508 in words is "twenty-one trillion, four hundred twenty-three billion, seven hundred eight million, eight hundred twenty-five thousand, five hundred eight".