343440240421 has 4 divisors (see below), whose sum is σ = 343444105612. Its totient is φ = 343436375232.

The previous prime is 343440240391. The next prime is 343440240511. The reversal of 343440240421 is 124042044343.

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 23181585025 + 320258655396 = 152255^2 + 565914^2 .

It is a cyclic number.

It is not a de Polignac number, because 343440240421 - 2¹¹ = 343440238373 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 (343440240721) 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, 1796100 + ... + 1978093.

It is an arithmetic number, because the mean of its divisors is an integer number (85861026403).

Almost surely, 2^343440240421 is an apocalyptic number.

It is an amenable number.

343440240421 is a deficient number, since it is larger than the sum of its proper divisors (3865191).

343440240421 is an equidigital number, since it uses as much as digits as its factorization.

343440240421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3865190.

The product of its (nonzero) digits is 36864, while the sum is 31.

Adding to 343440240421 its reverse (124042044343), we get a palindrome (467482284764).

The spelling of 343440240421 in words is "three hundred forty-three billion, four hundred forty million, two hundred forty thousand, four hundred twenty-one".