21342342239 has 2 divisors, whose sum is σ = 21342342240. Its totient is φ = 21342342238.

The previous prime is 21342342193. The next prime is 21342342277. The reversal of 21342342239 is 93224324312.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21342342239 - 2²⁰ = 21341293663 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21342342199 and 21342342208.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21342342289) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10671171119 + 10671171120.

It is an arithmetic number, because the mean of its divisors is an integer number (10671171120).

Almost surely, 2^21342342239 is an apocalyptic number.

21342342239 is a deficient number, since it is larger than the sum of its proper divisors (1).

21342342239 is an equidigital number, since it uses as much as digits as its factorization.

21342342239 is an evil number, because the sum of its binary digits is even.

The product of its digits is 62208, while the sum is 35.

The spelling of 21342342239 in words is "twenty-one billion, three hundred forty-two million, three hundred forty-two thousand, two hundred thirty-nine".