21836568041 has 2 divisors, whose sum is σ = 21836568042. Its totient is φ = 21836568040.

The previous prime is 21836567957. The next prime is 21836568043. The reversal of 21836568041 is 14086563812.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 21639586816 + 196981225 = 147104^2 + 14035^2 .

It is a cyclic number.

It is not a de Polignac number, because 21836568041 - 2¹⁰ = 21836567017 is a prime.

It is a Sophie Germain prime.

Together with 21836568043, it forms a pair of twin primes.

It is a Chen prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 21836567983 and 21836568001.

It is not a weakly prime, because it can be changed into another prime (21836568043) 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, 10918284020 + 10918284021.

It is an arithmetic number, because the mean of its divisors is an integer number (10918284021).

Almost surely, 2^21836568041 is an apocalyptic number.

It is an amenable number.

21836568041 is a deficient number, since it is larger than the sum of its proper divisors (1).

21836568041 is an equidigital number, since it uses as much as digits as its factorization.

21836568041 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 276480, while the sum is 44.

The spelling of 21836568041 in words is "twenty-one billion, eight hundred thirty-six million, five hundred sixty-eight thousand, forty-one".