163341221 has 2 divisors, whose sum is σ = 163341222. Its totient is φ = 163341220.

The previous prime is 163341209. The next prime is 163341229. The reversal of 163341221 is 122143361.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 127938721 + 35402500 = 11311^2 + 5950^2 .

It is an emirp because it is prime and its reverse (122143361) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 163341221 - 2¹⁰ = 163340197 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (163341229) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 81670610 + 81670611.

It is an arithmetic number, because the mean of its divisors is an integer number (81670611).

Almost surely, 2^163341221 is an apocalyptic number.

It is an amenable number.

163341221 is a deficient number, since it is larger than the sum of its proper divisors (1).

163341221 is an equidigital number, since it uses as much as digits as its factorization.

163341221 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 864, while the sum is 23.

The square root of 163341221 is about 12780.5015942255. The cubic root of 163341221 is about 546.6364650097.

Adding to 163341221 its reverse (122143361), we get a palindrome (285484582).

The spelling of 163341221 in words is "one hundred sixty-three million, three hundred forty-one thousand, two hundred twenty-one".