342430021 has 2 divisors, whose sum is σ = 342430022. Its totient is φ = 342430020.

The previous prime is 342430009. The next prime is 342430063. The reversal of 342430021 is 120034243.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 340956225 + 1473796 = 18465^2 + 1214^2 .

It is a cyclic number.

It is not a de Polignac number, because 342430021 - 2¹¹ = 342427973 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (342430091) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 171215010 + 171215011.

It is an arithmetic number, because the mean of its divisors is an integer number (171215011).

Almost surely, 2^342430021 is an apocalyptic number.

It is an amenable number.

342430021 is a deficient number, since it is larger than the sum of its proper divisors (1).

342430021 is an equidigital number, since it uses as much as digits as its factorization.

342430021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 576, while the sum is 19.

The square root of 342430021 is about 18504.8647928052. The cubic root of 342430021 is about 699.6120442095.

Adding to 342430021 its reverse (120034243), we get a palindrome (462464264).

The spelling of 342430021 in words is "three hundred forty-two million, four hundred thirty thousand, twenty-one".