342102421 has 2 divisors, whose sum is σ = 342102422. Its totient is φ = 342102420.

The previous prime is 342102419. The next prime is 342102499. The reversal of 342102421 is 124201243.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 210656196 + 131446225 = 14514^2 + 11465^2 .

It is a cyclic number.

It is not a de Polignac number, because 342102421 - 2¹ = 342102419 is a prime.

It is a super-2 number, since 2×342102421² = 234068132908122482, which contains 22 as substring.

Together with 342102419, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (342102521) 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, 171051210 + 171051211.

It is an arithmetic number, because the mean of its divisors is an integer number (171051211).

Almost surely, 2^342102421 is an apocalyptic number.

It is an amenable number.

342102421 is a deficient number, since it is larger than the sum of its proper divisors (1).

342102421 is an equidigital number, since it uses as much as digits as its factorization.

342102421 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 384, while the sum is 19.

The square root of 342102421 is about 18496.0109483099. The cubic root of 342102421 is about 699.3888686510.

Adding to 342102421 its reverse (124201243), we get a palindrome (466303664).

The spelling of 342102421 in words is "three hundred forty-two million, one hundred two thousand, four hundred twenty-one".