21707368368 has 160 divisors (see below), whose sum is σ = 67620672000. Its totient is φ = 5861818368.

The previous prime is 21707368363. The next prime is 21707368381. The reversal of 21707368368 is 86386370712.

It is a self number, because there is not a number n which added to its sum of digits gives 21707368368.

It is not an unprimeable number, because it can be changed into a prime (21707368363) by changing a digit.

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 31 ways as a sum of consecutive naturals, for example, 2862630 + ... + 2870202.

It is an arithmetic number, because the mean of its divisors is an integer number (422629200).

Almost surely, 2^21707368368 is an apocalyptic number.

21707368368 is a gapful number since it is divisible by the number (28) 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 21707368368, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (33810336000).

21707368368 is an abundant number, since it is smaller than the sum of its proper divisors (45913303632).

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

21707368368 is a wasteful number, since it uses less digits than its factorization.

21707368368 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8059 (or 8053 counting only the distinct ones).

The product of its (nonzero) digits is 2032128, while the sum is 51.

The spelling of 21707368368 in words is "twenty-one billion, seven hundred seven million, three hundred sixty-eight thousand, three hundred sixty-eight".