21316680000 has 840 divisors, whose sum is σ = 95314739520. Its totient is φ = 4423680000.

The previous prime is 21316679987. The next prime is 21316680043. The reversal of 21316680000 is 8661312.

It is a tau number, because it is divible by the number of its divisors (840).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 119 ways as a sum of consecutive naturals, for example, 27719616 + ... + 27720384.

It is an arithmetic number, because the mean of its divisors is an integer number (113469928).

Almost surely, 2^21316680000 is an apocalyptic number.

21316680000 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 21316680000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (47657369760).

21316680000 is an abundant number, since it is smaller than the sum of its proper divisors (73998059520).

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

21316680000 is a wasteful number, since it uses less digits than its factorization.

21316680000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 825 (or 797 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 27.

The spelling of 21316680000 in words is "twenty-one billion, three hundred sixteen million, six hundred eighty thousand".