343242056821 has 4 divisors (see below), whose sum is σ = 343283078700. Its totient is φ = 343201034944.

The previous prime is 343242056783. The next prime is 343242056827. The reversal of 343242056821 is 128650242343.

It is a happy number.

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 271273263921 + 71968792900 = 520839^2 + 268270^2 .

It is a cyclic number.

It is not a de Polignac number, because 343242056821 - 2⁷ = 343242056693 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 (343242056827) 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, 20498386 + ... + 20515123.

It is an arithmetic number, because the mean of its divisors is an integer number (85820769675).

Almost surely, 2^343242056821 is an apocalyptic number.

It is an amenable number.

343242056821 is a deficient number, since it is larger than the sum of its proper divisors (41021879).

343242056821 is an equidigital number, since it uses as much as digits as its factorization.

343242056821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 41021878.

The product of its (nonzero) digits is 276480, while the sum is 40.

The spelling of 343242056821 in words is "three hundred forty-three billion, two hundred forty-two million, fifty-six thousand, eight hundred twenty-one".