21342241342439 has 2 divisors, whose sum is σ = 21342241342440. Its totient is φ = 21342241342438.

The previous prime is 21342241342403. The next prime is 21342241342441. The reversal of 21342241342439 is 93424314224312.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21342241342439 is a prime.

Together with 21342241342441, it forms a pair of twin primes.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21342241342439.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21342241341439) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10671120671219 + 10671120671220.

It is an arithmetic number, because the mean of its divisors is an integer number (10671120671220).

Almost surely, 2^{21342241342439} is an apocalyptic number.

21342241342439 is a deficient number, since it is larger than the sum of its proper divisors (1).

21342241342439 is an equidigital number, since it uses as much as digits as its factorization.

21342241342439 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 995328, while the sum is 44.

The spelling of 21342241342439 in words is "twenty-one trillion, three hundred forty-two billion, two hundred forty-one million, three hundred forty-two thousand, four hundred thirty-nine".