321201217 has 2 divisors, whose sum is σ = 321201218. Its totient is φ = 321201216.

The previous prime is 321201203. The next prime is 321201229. The reversal of 321201217 is 712102123.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 273439296 + 47761921 = 16536^2 + 6911^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-321201217 is a prime.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 321201194 and 321201203.

It is not a weakly prime, because it can be changed into another prime (321201017) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 160600608 + 160600609.

It is an arithmetic number, because the mean of its divisors is an integer number (160600609).

Almost surely, 2^321201217 is an apocalyptic number.

It is an amenable number.

321201217 is a deficient number, since it is larger than the sum of its proper divisors (1).

321201217 is an equidigital number, since it uses as much as digits as its factorization.

321201217 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 168, while the sum is 19.

The square root of 321201217 is about 17922.0874063263. The cubic root of 321201217 is about 684.8451650682.

The spelling of 321201217 in words is "three hundred twenty-one million, two hundred one thousand, two hundred seventeen".