163232221 has 2 divisors, whose sum is σ = 163232222. Its totient is φ = 163232220.

The previous prime is 163232191. The next prime is 163232227. The reversal of 163232221 is 122232361.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 131928196 + 31304025 = 11486^2 + 5595^2 .

It is a cyclic number.

It is not a de Polignac number, because 163232221 - 2⁵ = 163232189 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 163232192 and 163232201.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (163232227) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 81616110 + 81616111.

It is an arithmetic number, because the mean of its divisors is an integer number (81616111).

Almost surely, 2^163232221 is an apocalyptic number.

It is an amenable number.

163232221 is a deficient number, since it is larger than the sum of its proper divisors (1).

163232221 is an equidigital number, since it uses as much as digits as its factorization.

163232221 is an evil number, because the sum of its binary digits is even.

The product of its digits is 864, while the sum is 22.

The square root of 163232221 is about 12776.2365742029. The cubic root of 163232221 is about 546.5148451009.

Adding to 163232221 its reverse (122232361), we get a palindrome (285464582).

The spelling of 163232221 in words is "one hundred sixty-three million, two hundred thirty-two thousand, two hundred twenty-one".