342438221 has 2 divisors, whose sum is σ = 342438222. Its totient is φ = 342438220.

The previous prime is 342438211. The next prime is 342438233. The reversal of 342438221 is 122834243.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 341140900 + 1297321 = 18470^2 + 1139^2 .

It is a cyclic number.

It is not a de Polignac number, because 342438221 - 2¹⁰ = 342437197 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (342438211) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 171219110 + 171219111.

It is an arithmetic number, because the mean of its divisors is an integer number (171219111).

Almost surely, 2^342438221 is an apocalyptic number.

It is an amenable number.

342438221 is a deficient number, since it is larger than the sum of its proper divisors (1).

342438221 is an equidigital number, since it uses as much as digits as its factorization.

342438221 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 9216, while the sum is 29.

The square root of 342438221 is about 18505.0863548377. The cubic root of 342438221 is about 699.6176285846.

The spelling of 342438221 in words is "three hundred forty-two million, four hundred thirty-eight thousand, two hundred twenty-one".