11657251321 has 2 divisors, whose sum is σ = 11657251322. Its totient is φ = 11657251320.

The previous prime is 11657251289. The next prime is 11657251349. The reversal of 11657251321 is 12315275611.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 10318496400 + 1338754921 = 101580^2 + 36589^2 .

It is an emirp because it is prime and its reverse (12315275611) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 11657251321 - 2⁵ = 11657251289 is a prime.

It is not a weakly prime, because it can be changed into another prime (11657251351) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5828625660 + 5828625661.

It is an arithmetic number, because the mean of its divisors is an integer number (5828625661).

Almost surely, 2^11657251321 is an apocalyptic number.

It is an amenable number.

11657251321 is a deficient number, since it is larger than the sum of its proper divisors (1).

11657251321 is an equidigital number, since it uses as much as digits as its factorization.

11657251321 is an evil number, because the sum of its binary digits is even.

The product of its digits is 12600, while the sum is 34.

The spelling of 11657251321 in words is "eleven billion, six hundred fifty-seven million, two hundred fifty-one thousand, three hundred twenty-one".