21713222368 has 48 divisors (see below), whose sum is σ = 44163270144. Its totient is φ = 10497732480.

The previous prime is 21713222357. The next prime is 21713222369. The reversal of 21713222368 is 86322231712.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21713222369) 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 7 ways as a sum of consecutive naturals, for example, 1288171 + ... + 1304917.

It is an arithmetic number, because the mean of its divisors is an integer number (920068128).

Almost surely, 2^21713222368 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 21713222368, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (22081635072).

21713222368 is an abundant number, since it is smaller than the sum of its proper divisors (22450047776).

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

21713222368 is a wasteful number, since it uses less digits than its factorization.

21713222368 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18095 (or 18087 counting only the distinct ones).

The product of its digits is 48384, while the sum is 37.

The spelling of 21713222368 in words is "twenty-one billion, seven hundred thirteen million, two hundred twenty-two thousand, three hundred sixty-eight".