21111189168 has 40 divisors (see below), whose sum is σ = 54548602416. Its totient is φ = 7035596800.

The previous prime is 21111189149. The next prime is 21111189221. The reversal of 21111189168 is 86198111112.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 200608 + ... + 287168.

Almost surely, 2^21111189168 is an apocalyptic number.

It is an amenable number.

21111189168 is an abundant number, since it is smaller than the sum of its proper divisors (33437413248).

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

21111189168 is a wasteful number, since it uses less digits than its factorization.

21111189168 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 91653 (or 91647 counting only the distinct ones).

The product of its digits is 6912, while the sum is 39.

The spelling of 21111189168 in words is "twenty-one billion, one hundred eleven million, one hundred eighty-nine thousand, one hundred sixty-eight".