21568702848 has 256 divisors, whose sum is σ = 73736110080. Its totient is φ = 5421312000.

The previous prime is 21568702807. The next prime is 21568702849. The reversal of 21568702848 is 84820786512.

It is a super-2 number, since 2×21568702848² (a number of 21 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 21568702848.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21568702849) 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 31 ways as a sum of consecutive naturals, for example, 904843 + ... + 928373.

It is an arithmetic number, because the mean of its divisors is an integer number (288031680).

Almost surely, 2^21568702848 is an apocalyptic number.

21568702848 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 21568702848, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (36868055040).

21568702848 is an abundant number, since it is smaller than the sum of its proper divisors (52167407232).

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

21568702848 is a wasteful number, since it uses less digits than its factorization.

21568702848 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23597 (or 23585 counting only the distinct ones).

The product of its (nonzero) digits is 1720320, while the sum is 51.

The spelling of 21568702848 in words is "twenty-one billion, five hundred sixty-eight million, seven hundred two thousand, eight hundred forty-eight".