21667675216 has 60 divisors (see below), whose sum is σ = 46177731936. Its totient is φ = 9841860160.

The previous prime is 21667675207. The next prime is 21667675217. The reversal of 21667675216 is 61257676612.

It is a self number, because there is not a number n which added to its sum of digits gives 21667675216.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21667675217) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 3456501 + ... + 3462763.

Almost surely, 2^21667675216 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21667675216, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (23088865968).

21667675216 is an abundant number, since it is smaller than the sum of its proper divisors (24510056720).

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

21667675216 is a wasteful number, since it uses less digits than its factorization.

21667675216 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8080 (or 8063 counting only the distinct ones).

The product of its digits is 1270080, while the sum is 49.

The spelling of 21667675216 in words is "twenty-one billion, six hundred sixty-seven million, six hundred seventy-five thousand, two hundred sixteen".