340213121 has 4 divisors (see below), whose sum is σ = 348511044. Its totient is φ = 331915200.

The previous prime is 340213073. The next prime is 340213151. The reversal of 340213121 is 121312043.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 200618896 + 139594225 = 14164^2 + 11815^2 .

It is a cyclic number.

It is not a de Polignac number, because 340213121 - 2¹⁴ = 340196737 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 340213121.

It is not an unprimeable number, because it can be changed into a prime (340213151) 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 in 3 ways as a sum of consecutive naturals, for example, 4148900 + ... + 4148981.

It is an arithmetic number, because the mean of its divisors is an integer number (87127761).

Almost surely, 2^340213121 is an apocalyptic number.

It is an amenable number.

340213121 is a deficient number, since it is larger than the sum of its proper divisors (8297923).

340213121 is an equidigital number, since it uses as much as digits as its factorization.

340213121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8297922.

The product of its (nonzero) digits is 144, while the sum is 17.

The square root of 340213121 is about 18444.8670637660. The cubic root of 340213121 is about 698.0990060791.

Adding to 340213121 its reverse (121312043), we get a palindrome (461525164).

The spelling of 340213121 in words is "three hundred forty million, two hundred thirteen thousand, one hundred twenty-one".