21338875518 has 8 divisors (see below), whose sum is σ = 42677751048. Its totient is φ = 7112958504.

The previous prime is 21338875511. The next prime is 21338875559. The reversal of 21338875518 is 81557883312.

It is a sphenic number, since it is the product of 3 distinct primes.

21338875518 is an admirable number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21338875511) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 1778239621 + ... + 1778239632.

It is an arithmetic number, because the mean of its divisors is an integer number (5334718881).

Almost surely, 2^21338875518 is an apocalyptic number.

21338875518 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

21338875518 is a wasteful number, since it uses less digits than its factorization.

21338875518 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3556479258.

The product of its digits is 1612800, while the sum is 51.

The spelling of 21338875518 in words is "twenty-one billion, three hundred thirty-eight million, eight hundred seventy-five thousand, five hundred eighteen".