11365697621 has 2 divisors, whose sum is σ = 11365697622. Its totient is φ = 11365697620.

The previous prime is 11365697579. The next prime is 11365697627. The reversal of 11365697621 is 12679656311.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 9552130225 + 1813567396 = 97735^2 + 42586^2 .

It is a cyclic number.

It is not a de Polignac number, because 11365697621 - 2⁶ = 11365697557 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (11365697627) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5682848810 + 5682848811.

It is an arithmetic number, because the mean of its divisors is an integer number (5682848811).

Almost surely, 2^11365697621 is an apocalyptic number.

It is an amenable number.

11365697621 is a deficient number, since it is larger than the sum of its proper divisors (1).

11365697621 is an equidigital number, since it uses as much as digits as its factorization.

11365697621 is an evil number, because the sum of its binary digits is even.

The product of its digits is 408240, while the sum is 47.

The spelling of 11365697621 in words is "eleven billion, three hundred sixty-five million, six hundred ninety-seven thousand, six hundred twenty-one".