12338958521 has 2 divisors, whose sum is σ = 12338958522. Its totient is φ = 12338958520.

The previous prime is 12338958481. The next prime is 12338958553. The reversal of 12338958521 is 12585983321.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 10606734121 + 1732224400 = 102989^2 + 41620^2 .

It is an emirp because it is prime and its reverse (12585983321) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-12338958521 is a prime.

It is not a weakly prime, because it can be changed into another prime (12338928521) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6169479260 + 6169479261.

It is an arithmetic number, because the mean of its divisors is an integer number (6169479261).

Almost surely, 2^12338958521 is an apocalyptic number.

It is an amenable number.

12338958521 is a deficient number, since it is larger than the sum of its proper divisors (1).

12338958521 is an equidigital number, since it uses as much as digits as its factorization.

12338958521 is an evil number, because the sum of its binary digits is even.

The product of its digits is 518400, while the sum is 47.

The spelling of 12338958521 in words is "twelve billion, three hundred thirty-eight million, nine hundred fifty-eight thousand, five hundred twenty-one".