21726822568 has 16 divisors (see below), whose sum is σ = 44441228160. Its totient is φ = 9875828400.

The previous prime is 21726822547. The next prime is 21726822571. The reversal of 21726822568 is 86522862712.

It is a happy number.

It is a super-2 number, since 2×21726822568² (a number of 21 digits) contains 22 as substring.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 123447768 + ... + 123447943.

It is an arithmetic number, because the mean of its divisors is an integer number (2777576760).

Almost surely, 2^21726822568 is an apocalyptic number.

It is an amenable number.

21726822568 is an abundant number, since it is smaller than the sum of its proper divisors (22714405592).

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

21726822568 is a wasteful number, since it uses less digits than its factorization.

21726822568 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 246895728 (or 246895724 counting only the distinct ones).

The product of its digits is 1290240, while the sum is 49.

The spelling of 21726822568 in words is "twenty-one billion, seven hundred twenty-six million, eight hundred twenty-two thousand, five hundred sixty-eight".