321025200161 has 2 divisors, whose sum is σ = 321025200162. Its totient is φ = 321025200160.

The previous prime is 321025200149. The next prime is 321025200263. The reversal of 321025200161 is 161002520123.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 271108703761 + 49916496400 = 520681^2 + 223420^2 .

It is a cyclic number.

It is not a de Polignac number, because 321025200161 - 2¹⁴ = 321025183777 is a prime.

It is a super-2 number, since 2×321025200161² (a number of 24 digits) contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (321025202161) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 160512600080 + 160512600081.

It is an arithmetic number, because the mean of its divisors is an integer number (160512600081).

Almost surely, 2^321025200161 is an apocalyptic number.

It is an amenable number.

321025200161 is a deficient number, since it is larger than the sum of its proper divisors (1).

321025200161 is an equidigital number, since it uses as much as digits as its factorization.

321025200161 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 720, while the sum is 23.

Adding to 321025200161 its reverse (161002520123), we get a palindrome (482027720284).

The spelling of 321025200161 in words is "three hundred twenty-one billion, twenty-five million, two hundred thousand, one hundred sixty-one".