343313021 has 4 divisors (see below), whose sum is σ = 344332092. Its totient is φ = 342293952.

The previous prime is 343312979. The next prime is 343313023. The reversal of 343313021 is 120313343.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 44368921 + 298944100 = 6661^2 + 17290^2 .

It is a cyclic number.

It is not a de Polignac number, because 343313021 - 2¹⁴ = 343296637 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 343312984 and 343313002.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (343313023) 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, 509030 + ... + 509703.

It is an arithmetic number, because the mean of its divisors is an integer number (86083023).

Almost surely, 2^343313021 is an apocalyptic number.

It is an amenable number.

343313021 is a deficient number, since it is larger than the sum of its proper divisors (1019071).

343313021 is a wasteful number, since it uses less digits than its factorization.

343313021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1019070.

The product of its (nonzero) digits is 648, while the sum is 20.

The square root of 343313021 is about 18528.7080229572. The cubic root of 343313021 is about 700.2128747126.

Adding to 343313021 its reverse (120313343), we get a palindrome (463626364).

The spelling of 343313021 in words is "three hundred forty-three million, three hundred thirteen thousand, twenty-one".