21166530057888 has 96 divisors (see below), whose sum is σ = 55703777008320. Its totient is φ = 7037528156160.

The previous prime is 21166530057887. The next prime is 21166530057917. The reversal of 21166530057888 is 88875003566112.

It is a tau number, because it is divible by the number of its divisors (96).

It is not an unprimeable number, because it can be changed into a prime (21166530057887) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 484770778 + ... + 484814438.

It is an arithmetic number, because the mean of its divisors is an integer number (580247677170).

Almost surely, 2^{21166530057888} is an apocalyptic number.

It is an amenable number.

21166530057888 is an abundant number, since it is smaller than the sum of its proper divisors (34537246950432).

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

21166530057888 is a wasteful number, since it uses less digits than its factorization.

21166530057888 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 56430 (or 56422 counting only the distinct ones).

The product of its (nonzero) digits is 19353600, while the sum is 60.

The spelling of 21166530057888 in words is "twenty-one trillion, one hundred sixty-six billion, five hundred thirty million, fifty-seven thousand, eight hundred eighty-eight".