21068304320 has 224 divisors, whose sum is σ = 59676426240. Its totient is φ = 6932459520.

The previous prime is 21068304317. The next prime is 21068304329. The reversal of 21068304320 is 2340386012.

It is a tau number, because it is divible by the number of its divisors (224).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21068304329) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 8817686 + ... + 8820074.

Almost surely, 2^21068304320 is an apocalyptic number.

21068304320 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 21068304320, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (29838213120).

21068304320 is an abundant number, since it is smaller than the sum of its proper divisors (38608121920).

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

21068304320 is a wasteful number, since it uses less digits than its factorization.

21068304320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2571 (or 2561 counting only the distinct ones).

The product of its (nonzero) digits is 6912, while the sum is 29.

The spelling of 21068304320 in words is "twenty-one billion, sixty-eight million, three hundred four thousand, three hundred twenty".