21166371147688 has 64 divisors (see below), whose sum is σ = 42813801112320. Its totient is φ = 9752190739200.

The previous prime is 21166371147659. The next prime is 21166371147689. The reversal of 21166371147688 is 88674117366112.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (21166371147689) 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, 151236223 + ... + 151376113.

It is an arithmetic number, because the mean of its divisors is an integer number (668965642380).

Almost surely, 2^{21166371147688} is an apocalyptic number.

It is an amenable number.

21166371147688 is an abundant number, since it is smaller than the sum of its proper divisors (21647429964632).

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

21166371147688 is a wasteful number, since it uses less digits than its factorization.

21166371147688 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 142418 (or 142414 counting only the distinct ones).

The product of its digits is 16257024, while the sum is 61.

The spelling of 21166371147688 in words is "twenty-one trillion, one hundred sixty-six billion, three hundred seventy-one million, one hundred forty-seven thousand, six hundred eighty-eight".