21326824518 has 64 divisors (see below), whose sum is σ = 44976384000. Its totient is φ = 6731830784.

The previous prime is 21326824507. The next prime is 21326824549. The reversal of 21326824518 is 81542862312.

It is a self number, because there is not a number n which added to its sum of digits gives 21326824518.

It is a congruent number.

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 31 ways as a sum of consecutive naturals, for example, 4915246 + ... + 4919582.

It is an arithmetic number, because the mean of its divisors is an integer number (702756000).

Almost surely, 2^21326824518 is an apocalyptic number.

21326824518 is an abundant number, since it is smaller than the sum of its proper divisors (23649559482).

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

21326824518 is a wasteful number, since it uses less digits than its factorization.

21326824518 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4909.

The product of its digits is 184320, while the sum is 42.

The spelling of 21326824518 in words is "twenty-one billion, three hundred twenty-six million, eight hundred twenty-four thousand, five hundred eighteen".