21342312239 has 2 divisors, whose sum is σ = 21342312240. Its totient is φ = 21342312238.

The previous prime is 21342312197. The next prime is 21342312247. The reversal of 21342312239 is 93221324312.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21342312239 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21342312289) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10671156119 + 10671156120.

It is an arithmetic number, because the mean of its divisors is an integer number (10671156120).

Almost surely, 2^21342312239 is an apocalyptic number.

21342312239 is a deficient number, since it is larger than the sum of its proper divisors (1).

21342312239 is an equidigital number, since it uses as much as digits as its factorization.

21342312239 is an evil number, because the sum of its binary digits is even.

The product of its digits is 15552, while the sum is 32.

The spelling of 21342312239 in words is "twenty-one billion, three hundred forty-two million, three hundred twelve thousand, two hundred thirty-nine".