343544021 has 2 divisors, whose sum is σ = 343544022. Its totient is φ = 343544020.

The previous prime is 343543957. The next prime is 343544029. The reversal of 343544021 is 120445343.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 338044996 + 5499025 = 18386^2 + 2345^2 .

It is an emirp because it is prime and its reverse (120445343) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 343544021 - 2⁶ = 343543957 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (343544029) 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, 171772010 + 171772011.

It is an arithmetic number, because the mean of its divisors is an integer number (171772011).

Almost surely, 2^343544021 is an apocalyptic number.

It is an amenable number.

343544021 is a deficient number, since it is larger than the sum of its proper divisors (1).

343544021 is an equidigital number, since it uses as much as digits as its factorization.

343544021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 5760, while the sum is 26.

The square root of 343544021 is about 18534.9405448197. The cubic root of 343544021 is about 700.3698868267.

Adding to 343544021 its reverse (120445343), we get a palindrome (463989364).

The spelling of 343544021 in words is "three hundred forty-three million, five hundred forty-four thousand, twenty-one".