343123021 has 2 divisors, whose sum is σ = 343123022. Its totient is φ = 343123020.

The previous prime is 343123009. The next prime is 343123051. The reversal of 343123021 is 120321343.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 186622921 + 156500100 = 13661^2 + 12510^2 .

It is an emirp because it is prime and its reverse (120321343) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 343123021 - 2⁷ = 343122893 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 343123021.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (343123051) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 171561510 + 171561511.

It is an arithmetic number, because the mean of its divisors is an integer number (171561511).

Almost surely, 2^343123021 is an apocalyptic number.

It is an amenable number.

343123021 is a deficient number, since it is larger than the sum of its proper divisors (1).

343123021 is an equidigital number, since it uses as much as digits as its factorization.

343123021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 432, while the sum is 19.

The square root of 343123021 is about 18523.5801345204. The cubic root of 343123021 is about 700.0836777519.

Adding to 343123021 its reverse (120321343), we get a palindrome (463444364).

The spelling of 343123021 in words is "three hundred forty-three million, one hundred twenty-three thousand, twenty-one".