21112518166 has 8 divisors (see below), whose sum is σ = 31870489680. Its totient is φ = 10489021608.

The previous prime is 21112518157. The next prime is 21112518221. The reversal of 21112518166 is 66181521112.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 33618346 + ... + 33618973.

It is an arithmetic number, because the mean of its divisors is an integer number (3983811210).

Almost surely, 2^21112518166 is an apocalyptic number.

21112518166 is a deficient number, since it is larger than the sum of its proper divisors (10757971514).

21112518166 is a wasteful number, since it uses less digits than its factorization.

21112518166 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 67237478.

The product of its digits is 5760, while the sum is 34.

The spelling of 21112518166 in words is "twenty-one billion, one hundred twelve million, five hundred eighteen thousand, one hundred sixty-six".