21311112341 has 2 divisors, whose sum is σ = 21311112342. Its totient is φ = 21311112340.

The previous prime is 21311112299. The next prime is 21311112379. The reversal of 21311112341 is 14321111312.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 16267982116 + 5043130225 = 127546^2 + 71015^2 .

It is a cyclic number.

It is not a de Polignac number, because 21311112341 - 2¹⁴ = 21311095957 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21311112391) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10655556170 + 10655556171.

It is an arithmetic number, because the mean of its divisors is an integer number (10655556171).

Almost surely, 2^21311112341 is an apocalyptic number.

It is an amenable number.

21311112341 is a deficient number, since it is larger than the sum of its proper divisors (1).

21311112341 is an equidigital number, since it uses as much as digits as its factorization.

21311112341 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 144, while the sum is 20.

Adding to 21311112341 its reverse (14321111312), we get a palindrome (35632223653).

The spelling of 21311112341 in words is "twenty-one billion, three hundred eleven million, one hundred twelve thousand, three hundred forty-one".