324131221 has 2 divisors, whose sum is σ = 324131222. Its totient is φ = 324131220.

The previous prime is 324131209. The next prime is 324131251. The reversal of 324131221 is 122131423.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 166126321 + 158004900 = 12889^2 + 12570^2 .

It is a cyclic number.

It is not a de Polignac number, because 324131221 - 2⁵ = 324131189 is a prime.

It is a super-2 number, since 2×324131221² = 210122096853901682, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (324131251) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 162065610 + 162065611.

It is an arithmetic number, because the mean of its divisors is an integer number (162065611).

Almost surely, 2^324131221 is an apocalyptic number.

It is an amenable number.

324131221 is a deficient number, since it is larger than the sum of its proper divisors (1).

324131221 is an equidigital number, since it uses as much as digits as its factorization.

324131221 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 288, while the sum is 19.

The square root of 324131221 is about 18003.6446587906. The cubic root of 324131221 is about 686.9212555774.

Adding to 324131221 its reverse (122131423), we get a palindrome (446262644).

The spelling of 324131221 in words is "three hundred twenty-four million, one hundred thirty-one thousand, two hundred twenty-one".