11810681321 has 2 divisors, whose sum is σ = 11810681322. Its totient is φ = 11810681320.

The previous prime is 11810681299. The next prime is 11810681341. The reversal of 11810681321 is 12318601811.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 7326504025 + 4484177296 = 85595^2 + 66964^2 .

It is an emirp because it is prime and its reverse (12318601811) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 11810681321 - 2¹⁴ = 11810664937 is a prime.

It is not a weakly prime, because it can be changed into another prime (11810681341) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5905340660 + 5905340661.

It is an arithmetic number, because the mean of its divisors is an integer number (5905340661).

Almost surely, 2^11810681321 is an apocalyptic number.

It is an amenable number.

11810681321 is a deficient number, since it is larger than the sum of its proper divisors (1).

11810681321 is an equidigital number, since it uses as much as digits as its factorization.

11810681321 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2304, while the sum is 32.

The spelling of 11810681321 in words is "eleven billion, eight hundred ten million, six hundred eighty-one thousand, three hundred twenty-one".