340043321 has 2 divisors, whose sum is σ = 340043322. Its totient is φ = 340043320.

The previous prime is 340043303. The next prime is 340043351. The reversal of 340043321 is 123340043.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 226833721 + 113209600 = 15061^2 + 10640^2 .

It is an emirp because it is prime and its reverse (123340043) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-340043321 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 340043293 and 340043302.

It is not a weakly prime, because it can be changed into another prime (340043351) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 170021660 + 170021661.

It is an arithmetic number, because the mean of its divisors is an integer number (170021661).

Almost surely, 2^340043321 is an apocalyptic number.

It is an amenable number.

340043321 is a deficient number, since it is larger than the sum of its proper divisors (1).

340043321 is an equidigital number, since it uses as much as digits as its factorization.

340043321 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 864, while the sum is 20.

The square root of 340043321 is about 18440.2635827149. The cubic root of 340043321 is about 697.9828465994.

Adding to 340043321 its reverse (123340043), we get a palindrome (463383364).

The spelling of 340043321 in words is "three hundred forty million, forty-three thousand, three hundred twenty-one".