21828552222568 has 128 divisors (see below), whose sum is σ = 51132672460800. Its totient is φ = 8505377996544.

The previous prime is 21828552222517. The next prime is 21828552222569. The reversal of 21828552222568 is 86522225582812.

It is not an unprimeable number, because it can be changed into a prime (21828552222569) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 394423843 + ... + 394479181.

It is an arithmetic number, because the mean of its divisors is an integer number (399474003600).

Almost surely, 2^{21828552222568} is an apocalyptic number.

21828552222568 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 21828552222568, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (25566336230400).

21828552222568 is an abundant number, since it is smaller than the sum of its proper divisors (29304120238232).

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

21828552222568 is a wasteful number, since it uses less digits than its factorization.

21828552222568 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 63519 (or 63515 counting only the distinct ones).

The product of its digits is 24576000, while the sum is 58.

The spelling of 21828552222568 in words is "twenty-one trillion, eight hundred twenty-eight billion, five hundred fifty-two million, two hundred twenty-two thousand, five hundred sixty-eight".