21346344317 has 2 divisors, whose sum is σ = 21346344318. Its totient is φ = 21346344316.

The previous prime is 21346344211. The next prime is 21346344319. The reversal of 21346344317 is 71344364312.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 19335180601 + 2011163716 = 139051^2 + 44846^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21346344317 is a prime.

Together with 21346344319, 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 (21346344319) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10673172158 + 10673172159.

It is an arithmetic number, because the mean of its divisors is an integer number (10673172159).

Almost surely, 2^21346344317 is an apocalyptic number.

It is an amenable number.

21346344317 is a deficient number, since it is larger than the sum of its proper divisors (1).

21346344317 is an equidigital number, since it uses as much as digits as its factorization.

21346344317 is an evil number, because the sum of its binary digits is even.

The product of its digits is 145152, while the sum is 38.

The spelling of 21346344317 in words is "twenty-one billion, three hundred forty-six million, three hundred forty-four thousand, three hundred seventeen".