163242221 has 2 divisors, whose sum is σ = 163242222. Its totient is φ = 163242220.

The previous prime is 163242199. The next prime is 163242223. The reversal of 163242221 is 122242361.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 142539721 + 20702500 = 11939^2 + 4550^2 .

It is a cyclic number.

It is not a de Polignac number, because 163242221 - 2¹⁴ = 163225837 is a prime.

Together with 163242223, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (163242223) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 81621110 + 81621111.

It is an arithmetic number, because the mean of its divisors is an integer number (81621111).

Almost surely, 2^163242221 is an apocalyptic number.

It is an amenable number.

163242221 is a deficient number, since it is larger than the sum of its proper divisors (1).

163242221 is an equidigital number, since it uses as much as digits as its factorization.

163242221 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1152, while the sum is 23.

The square root of 163242221 is about 12776.6279197604. The cubic root of 163242221 is about 546.5260051460.

Adding to 163242221 its reverse (122242361), we get a palindrome (285484582).

The spelling of 163242221 in words is "one hundred sixty-three million, two hundred forty-two thousand, two hundred twenty-one".