343130021 has 4 divisors (see below), whose sum is σ = 369524652. Its totient is φ = 316735392.

The previous prime is 343130009. The next prime is 343130071. The reversal of 343130021 is 120031343.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 120031343 = 3769 ⋅31847.

It can be written as a sum of positive squares in 2 ways, for example, as 24900100 + 318229921 = 4990^2 + 17839^2 .

It is a cyclic number.

It is not a de Polignac number, because 343130021 - 2⁶ = 343129957 is a prime.

It is a super-2 number, since 2×343130021² = 235476422622920882, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (343130071) 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, 13197296 + ... + 13197321.

It is an arithmetic number, because the mean of its divisors is an integer number (92381163).

Almost surely, 2^343130021 is an apocalyptic number.

It is an amenable number.

343130021 is a deficient number, since it is larger than the sum of its proper divisors (26394631).

343130021 is a wasteful number, since it uses less digits than its factorization.

343130021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26394630.

The product of its (nonzero) digits is 216, while the sum is 17.

The square root of 343130021 is about 18523.7690819120. The cubic root of 343130021 is about 700.0884384860.

Adding to 343130021 its reverse (120031343), we get a palindrome (463161364).

The spelling of 343130021 in words is "three hundred forty-three million, one hundred thirty thousand, twenty-one".