163312021 has 8 divisors (see below), whose sum is σ = 169176600. Its totient is φ = 157463040.

The previous prime is 163312003. The next prime is 163312069. The reversal of 163312021 is 120213361.

It can be written as a sum of positive squares in 4 ways, for example, as 79388100 + 83923921 = 8910^2 + 9161^2 .

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

It is not a de Polignac number, because 163312021 - 2⁵ = 163311989 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 163312021.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (163312621) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 19981 + ... + 26941.

It is an arithmetic number, because the mean of its divisors is an integer number (21147075).

Almost surely, 2^163312021 is an apocalyptic number.

It is an amenable number.

163312021 is a deficient number, since it is larger than the sum of its proper divisors (5864579).

163312021 is an equidigital number, since it uses as much as digits as its factorization.

163312021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7799.

The product of its (nonzero) digits is 216, while the sum is 19.

The square root of 163312021 is about 12779.3591779870. The cubic root of 163312021 is about 546.6038895706.

Adding to 163312021 its reverse (120213361), we get a palindrome (283525382).

The spelling of 163312021 in words is "one hundred sixty-three million, three hundred twelve thousand, twenty-one".