21338660000 has 120 divisors (see below), whose sum is σ = 59996170080. Its totient is φ = 7316064000.

The previous prime is 21338659999. The next prime is 21338660033. The reversal of 21338660000 is 6683312.

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 19 ways as a sum of consecutive naturals, for example, 63791 + ... + 216209.

It is an arithmetic number, because the mean of its divisors is an integer number (499968084).

Almost surely, 2^21338660000 is an apocalyptic number.

21338660000 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21338660000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (29998085040).

21338660000 is an abundant number, since it is smaller than the sum of its proper divisors (38657510080).

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

21338660000 is an equidigital number, since it uses as much as digits as its factorization.

21338660000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 152456 (or 152433 counting only the distinct ones).

The product of its (nonzero) digits is 5184, while the sum is 29.

The spelling of 21338660000 in words is "twenty-one billion, three hundred thirty-eight million, six hundred sixty thousand".