343321213421 has 4 divisors (see below), whose sum is σ = 343340561244. Its totient is φ = 343301865600.

The previous prime is 343321213409. The next prime is 343321213439. The reversal of 343321213421 is 124312123343.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 124312123343 = 563 ⋅220803061.

It can be written as a sum of positive squares in 2 ways, for example, as 249139741321 + 94181472100 = 499139^2 + 306890^2 .

It is a cyclic number.

It is not a de Polignac number, because 343321213421 - 2⁶ = 343321213357 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 (343321213471) 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, 9647270 + ... + 9682791.

It is an arithmetic number, because the mean of its divisors is an integer number (85835140311).

Almost surely, 2^343321213421 is an apocalyptic number.

It is an amenable number.

343321213421 is a deficient number, since it is larger than the sum of its proper divisors (19347823).

343321213421 is a wasteful number, since it uses less digits than its factorization.

343321213421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19347822.

The product of its digits is 10368, while the sum is 29.

Adding to 343321213421 its reverse (124312123343), we get a palindrome (467633336764).

The spelling of 343321213421 in words is "three hundred forty-three billion, three hundred twenty-one million, two hundred thirteen thousand, four hundred twenty-one".