321224161 has 2 divisors, whose sum is σ = 321224162. Its totient is φ = 321224160.

The previous prime is 321224119. The next prime is 321224177. The reversal of 321224161 is 161422123.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 307791936 + 13432225 = 17544^2 + 3665^2 .

It is a cyclic number.

It is not a de Polignac number, because 321224161 - 2⁹ = 321223649 is a prime.

It is a super-2 number, since 2×321224161² = 206369923220307842, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (321225161) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 160612080 + 160612081.

It is an arithmetic number, because the mean of its divisors is an integer number (160612081).

Almost surely, 2^321224161 is an apocalyptic number.

It is an amenable number.

321224161 is a deficient number, since it is larger than the sum of its proper divisors (1).

321224161 is an equidigital number, since it uses as much as digits as its factorization.

321224161 is an evil number, because the sum of its binary digits is even.

The product of its digits is 576, while the sum is 22.

The square root of 321224161 is about 17922.7274989048. The cubic root of 321224161 is about 684.8614712677.

Adding to 321224161 its reverse (161422123), we get a palindrome (482646284).

The spelling of 321224161 in words is "three hundred twenty-one million, two hundred twenty-four thousand, one hundred sixty-one".