21723808560 has 40 divisors (see below), whose sum is σ = 67343807280. Its totient is φ = 5793015552.

The previous prime is 21723808541. The next prime is 21723808567. The reversal of 21723808560 is 6580832712.

It is a tau number, because it is divible by the number of its divisors (40).

It is not an unprimeable number, because it can be changed into a prime (21723808567) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 45257695 + ... + 45258174.

It is an arithmetic number, because the mean of its divisors is an integer number (1683595182).

Almost surely, 2^21723808560 is an apocalyptic number.

21723808560 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21723808560 is an abundant number, since it is smaller than the sum of its proper divisors (45619998720).

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

21723808560 is a wasteful number, since it uses less digits than its factorization.

21723808560 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 90515885 (or 90515879 counting only the distinct ones).

The product of its (nonzero) digits is 161280, while the sum is 42.

The spelling of 21723808560 in words is "twenty-one billion, seven hundred twenty-three million, eight hundred eight thousand, five hundred sixty".