163812221 has 8 divisors (see below), whose sum is σ = 173560320. Its totient is φ = 154076608.

The previous prime is 163812217. The next prime is 163812227. The reversal of 163812221 is 122218361.

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

It is a cyclic number.

It is not a de Polignac number, because 163812221 - 2² = 163812217 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (163812227) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 47270 + ... + 50616.

It is an arithmetic number, because the mean of its divisors is an integer number (21695040).

Almost surely, 2^163812221 is an apocalyptic number.

It is an amenable number.

163812221 is a deficient number, since it is larger than the sum of its proper divisors (9748099).

163812221 is a wasteful number, since it uses less digits than its factorization.

163812221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6243.

The product of its digits is 1152, while the sum is 26.

The square root of 163812221 is about 12798.9148368133. The cubic root of 163812221 is about 547.1613757837.

The spelling of 163812221 in words is "one hundred sixty-three million, eight hundred twelve thousand, two hundred twenty-one".