343421321 has 2 divisors, whose sum is σ = 343421322. Its totient is φ = 343421320.

The previous prime is 343421237. The next prime is 343421341. The reversal of 343421321 is 123124343.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 331422025 + 11999296 = 18205^2 + 3464^2 .

It is a cyclic number.

It is not a de Polignac number, because 343421321 - 2¹⁴ = 343404937 is a prime.

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 (343421341) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 171710660 + 171710661.

It is an arithmetic number, because the mean of its divisors is an integer number (171710661).

Almost surely, 2^343421321 is an apocalyptic number.

It is an amenable number.

343421321 is a deficient number, since it is larger than the sum of its proper divisors (1).

343421321 is an equidigital number, since it uses as much as digits as its factorization.

343421321 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1728, while the sum is 23.

The square root of 343421321 is about 18531.6302844623. The cubic root of 343421321 is about 700.2864956524.

Adding to 343421321 its reverse (123124343), we get a palindrome (466545664).

The spelling of 343421321 in words is "three hundred forty-three million, four hundred twenty-one thousand, three hundred twenty-one".