340204121 has 2 divisors, whose sum is σ = 340204122. Its totient is φ = 340204120.

The previous prime is 340204087. The next prime is 340204181. The reversal of 340204121 is 121402043.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 223801600 + 116402521 = 14960^2 + 10789^2 .

It is a cyclic number.

It is not a de Polignac number, because 340204121 - 2²⁶ = 273095257 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 340204121.

It is not a weakly prime, because it can be changed into another prime (340204181) 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, 170102060 + 170102061.

It is an arithmetic number, because the mean of its divisors is an integer number (170102061).

Almost surely, 2^340204121 is an apocalyptic number.

It is an amenable number.

340204121 is a deficient number, since it is larger than the sum of its proper divisors (1).

340204121 is an equidigital number, since it uses as much as digits as its factorization.

340204121 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 192, while the sum is 17.

The square root of 340204121 is about 18444.6230918390. The cubic root of 340204121 is about 698.0928501863.

Adding to 340204121 its reverse (121402043), we get a palindrome (461606164).

The spelling of 340204121 in words is "three hundred forty million, two hundred four thousand, one hundred twenty-one".