343317221 has 4 divisors (see below), whose sum is σ = 369726252. Its totient is φ = 316908192.

The previous prime is 343317217. The next prime is 343317223. The reversal of 343317221 is 122713343.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 122713343 = 19 ⋅6458597.

It can be written as a sum of positive squares in 2 ways, for example, as 113188321 + 230128900 = 10639^2 + 15170^2 .

It is a cyclic number.

It is not a de Polignac number, because 343317221 - 2² = 343317217 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (343317223) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 13204496 + ... + 13204521.

It is an arithmetic number, because the mean of its divisors is an integer number (92431563).

Almost surely, 2^343317221 is an apocalyptic number.

It is an amenable number.

343317221 is a deficient number, since it is larger than the sum of its proper divisors (26409031).

343317221 is a wasteful number, since it uses less digits than its factorization.

343317221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26409030.

The product of its digits is 3024, while the sum is 26.

The square root of 343317221 is about 18528.8213602485. The cubic root of 343317221 is about 700.2157301068.

The spelling of 343317221 in words is "three hundred forty-three million, three hundred seventeen thousand, two hundred twenty-one".