21364721267339 has 2 divisors, whose sum is σ = 21364721267340. Its totient is φ = 21364721267338.

The previous prime is 21364721267317. The next prime is 21364721267371. The reversal of 21364721267339 is 93376212746312.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21364721267339 is a prime.

It is not a weakly prime, because it can be changed into another prime (21364721260339) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10682360633669 + 10682360633670.

It is an arithmetic number, because the mean of its divisors is an integer number (10682360633670).

Almost surely, 2^{21364721267339} is an apocalyptic number.

21364721267339 is a deficient number, since it is larger than the sum of its proper divisors (1).

21364721267339 is an equidigital number, since it uses as much as digits as its factorization.

21364721267339 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 13716864, while the sum is 56.

The spelling of 21364721267339 in words is "twenty-one trillion, three hundred sixty-four billion, seven hundred twenty-one million, two hundred sixty-seven thousand, three hundred thirty-nine".