345201221 has 2 divisors, whose sum is σ = 345201222. Its totient is φ = 345201220.

The previous prime is 345201211. The next prime is 345201331. The reversal of 345201221 is 122102543.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 236728996 + 108472225 = 15386^2 + 10415^2 .

It is an emirp because it is prime and its reverse (122102543) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-345201221 is a prime.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 345201193 and 345201202.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (345201211) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 172600610 + 172600611.

It is an arithmetic number, because the mean of its divisors is an integer number (172600611).

Almost surely, 2^345201221 is an apocalyptic number.

It is an amenable number.

345201221 is a deficient number, since it is larger than the sum of its proper divisors (1).

345201221 is an equidigital number, since it uses as much as digits as its factorization.

345201221 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 480, while the sum is 20.

The square root of 345201221 is about 18579.5915186529. The cubic root of 345201221 is about 701.4942373461.

Adding to 345201221 its reverse (122102543), we get a palindrome (467303764).

The spelling of 345201221 in words is "three hundred forty-five million, two hundred one thousand, two hundred twenty-one".