7205321 has 2 divisors, whose sum is σ = 7205322. Its totient is φ = 7205320.

The previous prime is 7205309. The next prime is 7205327. The reversal of 7205321 is 1235027.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 5812921 + 1392400 = 2411^2 + 1180^2 .

It is an emirp because it is prime and its reverse (1235027) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 7205321 - 2¹⁸ = 6943177 is a prime.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 7205293 and 7205302.

It is not a weakly prime, because it can be changed into another prime (7205327) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3602660 + 3602661.

It is an arithmetic number, because the mean of its divisors is an integer number (3602661).

Almost surely, 2^7205321 is an apocalyptic number.

It is an amenable number.

7205321 is a deficient number, since it is larger than the sum of its proper divisors (1).

7205321 is an equidigital number, since it uses as much as digits as its factorization.

7205321 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 420, while the sum is 20.

The square root of 7205321 is about 2684.2728996881. The cubic root of 7205321 is about 193.1454334395.

The spelling of 7205321 in words is "seven million, two hundred five thousand, three hundred twenty-one".