21683868722 has 8 divisors (see below), whose sum is σ = 33404878956. Its totient is φ = 10548909072.

The previous prime is 21683868709. The next prime is 21683868743. The reversal of 21683868722 is 22786838612.

It can be written as a sum of positive squares in 2 ways, for example, as 21508862281 + 175006441 = 146659^2 + 13229^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 146512553 + ... + 146512700.

Almost surely, 2^21683868722 is an apocalyptic number.

21683868722 is a deficient number, since it is larger than the sum of its proper divisors (11721010234).

21683868722 is a wasteful number, since it uses less digits than its factorization.

21683868722 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 293025292.

The product of its digits is 3096576, while the sum is 53.

The spelling of 21683868722 in words is "twenty-one billion, six hundred eighty-three million, eight hundred sixty-eight thousand, seven hundred twenty-two".