221829621478168 has 16 divisors (see below), whose sum is σ = 453742407569160. Its totient is φ = 100831646126400.

The previous prime is 221829621478147. The next prime is 221829621478169. The reversal of 221829621478168 is 861874126928122.

221829621478168 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221829621478169) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1260395576493 + ... + 1260395576668.

Almost surely, 2^{221829621478168} is an apocalyptic number.

It is an amenable number.

221829621478168 is an abundant number, since it is smaller than the sum of its proper divisors (231912786090992).

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

221829621478168 is a wasteful number, since it uses less digits than its factorization.

221829621478168 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2520791153178 (or 2520791153174 counting only the distinct ones).

The product of its digits is 74317824, while the sum is 67.

The spelling of 221829621478168 in words is "two hundred twenty-one trillion, eight hundred twenty-nine billion, six hundred twenty-one million, four hundred seventy-eight thousand, one hundred sixty-eight".