163226221 has 2 divisors, whose sum is σ = 163226222. Its totient is φ = 163226220.

The previous prime is 163226183. The next prime is 163226227. The reversal of 163226221 is 122622361.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 141276996 + 21949225 = 11886^2 + 4685^2 .

It is a cyclic number.

It is not a de Polignac number, because 163226221 - 2⁹ = 163225709 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (163226227) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 81613110 + 81613111.

It is an arithmetic number, because the mean of its divisors is an integer number (81613111).

Almost surely, 2^163226221 is an apocalyptic number.

It is an amenable number.

163226221 is a deficient number, since it is larger than the sum of its proper divisors (1).

163226221 is an equidigital number, since it uses as much as digits as its factorization.

163226221 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1728, while the sum is 25.

The square root of 163226221 is about 12776.0017611145. The cubic root of 163226221 is about 546.5081488550.

Adding to 163226221 its reverse (122622361), we get a palindrome (285848582).

The spelling of 163226221 in words is "one hundred sixty-three million, two hundred twenty-six thousand, two hundred twenty-one".