343140021 has 12 divisors (see below), whose sum is σ = 566453472. Its totient is φ = 196079976.

The previous prime is 343139989. The next prime is 343140037. The reversal of 343140021 is 120041343.

It is not a de Polignac number, because 343140021 - 2⁵ = 343139989 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 343139976 and 343140003.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (343145021) 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, 2723271 + ... + 2723396.

It is an arithmetic number, because the mean of its divisors is an integer number (47204456).

Almost surely, 2^343140021 is an apocalyptic number.

It is an amenable number.

343140021 is a deficient number, since it is larger than the sum of its proper divisors (223313451).

343140021 is a wasteful number, since it uses less digits than its factorization.

343140021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5446680 (or 5446677 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 18.

The square root of 343140021 is about 18524.0390034139. The cubic root of 343140021 is about 700.0952394224.

Adding to 343140021 its reverse (120041343), we get a palindrome (463181364).

The spelling of 343140021 in words is "three hundred forty-three million, one hundred forty thousand, twenty-one".