21338426808 has 96 divisors (see below), whose sum is σ = 59968250160. Its totient is φ = 7108508160.

The previous prime is 21338426803. The next prime is 21338426839. The reversal of 21338426808 is 80862483312.

21338426808 is a `hidden beast` number, since 2 + 1 + 3 + 384 + 268 + 0 + 8 = 666.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21338426803) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 6065466 + ... + 6068982.

Almost surely, 2^21338426808 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21338426808, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (29984125080).

21338426808 is an abundant number, since it is smaller than the sum of its proper divisors (38629823352).

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

21338426808 is a wasteful number, since it uses less digits than its factorization.

21338426808 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6659 (or 6643 counting only the distinct ones).

The product of its (nonzero) digits is 442368, while the sum is 45.

The spelling of 21338426808 in words is "twenty-one billion, three hundred thirty-eight million, four hundred twenty-six thousand, eight hundred eight".