1311441332021 has 2 divisors, whose sum is σ = 1311441332022. Its totient is φ = 1311441332020.

The previous prime is 1311441331999. The next prime is 1311441332023. The reversal of 1311441332021 is 1202331441131.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1220496867121 + 90944464900 = 1104761^2 + 301570^2 .

It is an emirp because it is prime and its reverse (1202331441131) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1311441332021 - 2⁶ = 1311441331957 is a prime.

It is a Sophie Germain prime.

Together with 1311441332023, it forms a pair of twin primes.

It is a Chen 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 (1311441332023) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 655720666010 + 655720666011.

It is an arithmetic number, because the mean of its divisors is an integer number (655720666011).

Almost surely, 2^{1311441332021} is an apocalyptic number.

It is an amenable number.

1311441332021 is a deficient number, since it is larger than the sum of its proper divisors (1).

1311441332021 is an equidigital number, since it uses as much as digits as its factorization.

1311441332021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1728, while the sum is 26.

Adding to 1311441332021 its reverse (1202331441131), we get a palindrome (2513772773152).

The spelling of 1311441332021 in words is "one trillion, three hundred eleven billion, four hundred forty-one million, three hundred thirty-two thousand, twenty-one".