21041340041 has 2 divisors, whose sum is σ = 21041340042. Its totient is φ = 21041340040.

The previous prime is 21041339981. The next prime is 21041340059. The reversal of 21041340041 is 14004314012.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 10604674441 + 10436665600 = 102979^2 + 102160^2 .

It is a cyclic number.

It is not a de Polignac number, because 21041340041 - 2¹⁰ = 21041339017 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 21041339995 and 21041340022.

It is not a weakly prime, because it can be changed into another prime (21041340091) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10520670020 + 10520670021.

It is an arithmetic number, because the mean of its divisors is an integer number (10520670021).

Almost surely, 2^21041340041 is an apocalyptic number.

It is an amenable number.

21041340041 is a deficient number, since it is larger than the sum of its proper divisors (1).

21041340041 is an equidigital number, since it uses as much as digits as its factorization.

21041340041 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 384, while the sum is 20.

Adding to 21041340041 its reverse (14004314012), we get a palindrome (35045654053).

The spelling of 21041340041 in words is "twenty-one billion, forty-one million, three hundred forty thousand, forty-one".