343021 has 4 divisors (see below), whose sum is σ = 392032. Its totient is φ = 294012.

The previous prime is 343019. The next prime is 343037. The reversal of 343021 is 120343.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 120343 = 17 ⋅7079.

It is a cyclic number.

It is not a de Polignac number, because 343021 - 2¹ = 343019 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 342992 and 343010.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (343051) 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, 24495 + ... + 24508.

It is an arithmetic number, because the mean of its divisors is an integer number (98008).

2³⁴³⁰²¹ is an apocalyptic number.

It is an amenable number.

343021 is a deficient number, since it is larger than the sum of its proper divisors (49011).

343021 is an equidigital number, since it uses as much as digits as its factorization.

343021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 49010.

The product of its (nonzero) digits is 72, while the sum is 13.

The square root of 343021 is about 585.6799467286. The cubic root of 343021 is about 70.0014285423.

Adding to 343021 its reverse (120343), we get a palindrome (463364).

The spelling of 343021 in words is "three hundred forty-three thousand, twenty-one", and thus it is an iban number.