163343221 has 4 divisors (see below), whose sum is σ = 167327244. Its totient is φ = 159359200.

The previous prime is 163343203. The next prime is 163343227. The reversal of 163343221 is 122343361.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 122343361 = 7 ⋅17477623.

It can be written as a sum of positive squares in 2 ways, for example, as 57972996 + 105370225 = 7614^2 + 10265^2 .

It is a cyclic number.

It is not a de Polignac number, because 163343221 - 2⁹ = 163342709 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 (163343227) 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 3 ways as a sum of consecutive naturals, for example, 1991950 + ... + 1992031.

It is an arithmetic number, because the mean of its divisors is an integer number (41831811).

Almost surely, 2^163343221 is an apocalyptic number.

It is an amenable number.

163343221 is a deficient number, since it is larger than the sum of its proper divisors (3984023).

163343221 is an equidigital number, since it uses as much as digits as its factorization.

163343221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3984022.

The product of its digits is 2592, while the sum is 25.

The square root of 163343221 is about 12780.5798381764. The cubic root of 163343221 is about 546.6386960621.

Adding to 163343221 its reverse (122343361), we get a palindrome (285686582).

The spelling of 163343221 in words is "one hundred sixty-three million, three hundred forty-three thousand, two hundred twenty-one".