21522823168 has 96 divisors (see below), whose sum is σ = 53654590080. Its totient is φ = 8385454080.

The previous prime is 21522823141. The next prime is 21522823171. The reversal of 21522823168 is 86132822512.

It is a self number, because there is not a number n which added to its sum of digits gives 21522823168.

It is a congruent number.

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 7 ways as a sum of consecutive naturals, for example, 89455 + ... + 225937.

It is an arithmetic number, because the mean of its divisors is an integer number (558901980).

Almost surely, 2^21522823168 is an apocalyptic number.

21522823168 is a gapful number since it is divisible by the number (28) 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 21522823168, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (26827295040).

21522823168 is an abundant number, since it is smaller than the sum of its proper divisors (32131766912).

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

21522823168 is a wasteful number, since it uses less digits than its factorization.

21522823168 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 136523 (or 136503 counting only the distinct ones).

The product of its digits is 92160, while the sum is 40.

The spelling of 21522823168 in words is "twenty-one billion, five hundred twenty-two million, eight hundred twenty-three thousand, one hundred sixty-eight".