21722858560 has 112 divisors (see below), whose sum is σ = 56892358656. Its totient is φ = 7850022912.

The previous prime is 21722858543. The next prime is 21722858567. The reversal of 21722858560 is 6585822712.

It is a self number, because there is not a number n which added to its sum of digits gives 21722858560.

It is not an unprimeable number, because it can be changed into a prime (21722858567) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 139969 + ... + 251071.

It is an arithmetic number, because the mean of its divisors is an integer number (507967488).

Almost surely, 2^21722858560 is an apocalyptic number.

21722858560 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 21722858560, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (28446179328).

21722858560 is an abundant number, since it is smaller than the sum of its proper divisors (35169500096).

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

21722858560 is a wasteful number, since it uses less digits than its factorization.

21722858560 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 111180 (or 111170 counting only the distinct ones).

The product of its (nonzero) digits is 537600, while the sum is 46.

The spelling of 21722858560 in words is "twenty-one billion, seven hundred twenty-two million, eight hundred fifty-eight thousand, five hundred sixty".