163221816 has 32 divisors (see below), whose sum is σ = 409170960. Its totient is φ = 54258432.

The previous prime is 163221781. The next prime is 163221841. The reversal of 163221816 is 618122361.

It is a super-2 number, since 2×163221816² = 53282722436675712, which contains 22 as substring.

It is a nude number because it is divisible by every one of its digits.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 165 + ... + 18068.

Almost surely, 2^163221816 is an apocalyptic number.

It is an amenable number.

163221816 is an abundant number, since it is smaller than the sum of its proper divisors (245949144).

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

163221816 is a wasteful number, since it uses less digits than its factorization.

163221816 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18615 (or 18611 counting only the distinct ones).

The product of its digits is 3456, while the sum is 30.

The square root of 163221816 is about 12775.8293664247. The cubic root of 163221816 is about 546.5032325901.

The spelling of 163221816 in words is "one hundred sixty-three million, two hundred twenty-one thousand, eight hundred sixteen".