343005021 has 12 divisors (see below), whose sum is σ = 501019740. Its totient is φ = 226100160.

The previous prime is 343005017. The next prime is 343005031. The reversal of 343005021 is 120500343.

It can be written as a sum of positive squares in 2 ways, for example, as 39200121 + 303804900 = 6261^2 + 17430^2 .

It is not a de Polignac number, because 343005021 - 2² = 343005017 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 343004985 and 343005003.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (343005031) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 213310 + ... + 214911.

It is an arithmetic number, because the mean of its divisors is an integer number (41751645).

Almost surely, 2^343005021 is an apocalyptic number.

It is an amenable number.

343005021 is a deficient number, since it is larger than the sum of its proper divisors (158014719).

343005021 is a wasteful number, since it uses less digits than its factorization.

343005021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 428316 (or 428313 counting only the distinct ones).

The product of its (nonzero) digits is 360, while the sum is 18.

The square root of 343005021 is about 18520.3947312146. The cubic root of 343005021 is about 700.0034156296.

Adding to 343005021 its reverse (120500343), we get a palindrome (463505364).

The spelling of 343005021 in words is "three hundred forty-three million, five thousand, twenty-one".