342130021 has 2 divisors, whose sum is σ = 342130022. Its totient is φ = 342130020.

The previous prime is 342130007. The next prime is 342130031. The reversal of 342130021 is 120031243.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 210569121 + 131560900 = 14511^2 + 11470^2 .

It is an emirp because it is prime and its reverse (120031243) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 342130021 - 2⁹ = 342129509 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 342129977 and 342130004.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (342130031) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 171065010 + 171065011.

It is an arithmetic number, because the mean of its divisors is an integer number (171065011).

Almost surely, 2^342130021 is an apocalyptic number.

It is an amenable number.

342130021 is a deficient number, since it is larger than the sum of its proper divisors (1).

342130021 is an equidigital number, since it uses as much as digits as its factorization.

342130021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 144, while the sum is 16.

The square root of 342130021 is about 18496.7570400868. The cubic root of 342130021 is about 699.4076764822.

Adding to 342130021 its reverse (120031243), we get a palindrome (462161264).

The spelling of 342130021 in words is "three hundred forty-two million, one hundred thirty thousand, twenty-one".