21162673168 has 80 divisors (see below), whose sum is σ = 50610649600. Its totient is φ = 8347857408.

The previous prime is 21162673153. The next prime is 21162673171. The reversal of 21162673168 is 86137626112.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 487321 + ... + 528967.

It is an arithmetic number, because the mean of its divisors is an integer number (632633120).

Almost surely, 2^21162673168 is an apocalyptic number.

21162673168 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 21162673168, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (25305324800).

21162673168 is an abundant number, since it is smaller than the sum of its proper divisors (29447976432).

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

21162673168 is a wasteful number, since it uses less digits than its factorization.

21162673168 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42024 (or 42018 counting only the distinct ones).

The product of its digits is 145152, while the sum is 43.

The spelling of 21162673168 in words is "twenty-one billion, one hundred sixty-two million, six hundred seventy-three thousand, one hundred sixty-eight".