342347021 has 2 divisors, whose sum is σ = 342347022. Its totient is φ = 342347020.

The previous prime is 342346993. The next prime is 342347023. The reversal of 342347021 is 120743243.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 227557225 + 114789796 = 15085^2 + 10714^2 .

It is a cyclic number.

It is not a de Polignac number, because 342347021 - 2¹⁸ = 342084877 is a prime.

Together with 342347023, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (342347023) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 171173510 + 171173511.

It is an arithmetic number, because the mean of its divisors is an integer number (171173511).

Almost surely, 2^342347021 is an apocalyptic number.

It is an amenable number.

342347021 is a deficient number, since it is larger than the sum of its proper divisors (1).

342347021 is an equidigital number, since it uses as much as digits as its factorization.

342347021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4032, while the sum is 26.

The square root of 342347021 is about 18502.6220033810. The cubic root of 342347021 is about 699.5555144192. Note that the first 4 decimals are identical.

The spelling of 342347021 in words is "three hundred forty-two million, three hundred forty-seven thousand, twenty-one".