321321110197 has 2 divisors, whose sum is σ = 321321110198. Its totient is φ = 321321110196.

The previous prime is 321321110113. The next prime is 321321110203. The reversal of 321321110197 is 791011123123.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 212226983761 + 109094126436 = 460681^2 + 330294^2 .

It is a cyclic number.

It is not a de Polignac number, because 321321110197 - 2¹⁹ = 321320585909 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (321321110797) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 160660555098 + 160660555099.

It is an arithmetic number, because the mean of its divisors is an integer number (160660555099).

Almost surely, 2^321321110197 is an apocalyptic number.

It is an amenable number.

321321110197 is a deficient number, since it is larger than the sum of its proper divisors (1).

321321110197 is an equidigital number, since it uses as much as digits as its factorization.

321321110197 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2268, while the sum is 31.

The spelling of 321321110197 in words is "three hundred twenty-one billion, three hundred twenty-one million, one hundred ten thousand, one hundred ninety-seven".