321605136239 has 2 divisors, whose sum is σ = 321605136240. Its totient is φ = 321605136238.

The previous prime is 321605136211. The next prime is 321605136241. The reversal of 321605136239 is 932631506123.

It is a strong prime.

It is an emirp because it is prime and its reverse (932631506123) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 321605136239 - 2¹² = 321605132143 is a prime.

Together with 321605136241, it forms a pair of twin primes.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 321605136196 and 321605136205.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (321605106239) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 160802568119 + 160802568120.

It is an arithmetic number, because the mean of its divisors is an integer number (160802568120).

Almost surely, 2^321605136239 is an apocalyptic number.

321605136239 is a deficient number, since it is larger than the sum of its proper divisors (1).

321605136239 is an equidigital number, since it uses as much as digits as its factorization.

321605136239 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 174960, while the sum is 41.

The spelling of 321605136239 in words is "three hundred twenty-one billion, six hundred five million, one hundred thirty-six thousand, two hundred thirty-nine".