21131336741 has 2 divisors, whose sum is σ = 21131336742. Its totient is φ = 21131336740.

The previous prime is 21131336729. The next prime is 21131336747. The reversal of 21131336741 is 14763313112.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 14339104516 + 6792232225 = 119746^2 + 82415^2 .

It is a cyclic number.

It is not a de Polignac number, because 21131336741 - 2¹⁰ = 21131335717 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21131336698 and 21131336707.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21131336747) 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, 10565668370 + 10565668371.

It is an arithmetic number, because the mean of its divisors is an integer number (10565668371).

Almost surely, 2^21131336741 is an apocalyptic number.

It is an amenable number.

21131336741 is a deficient number, since it is larger than the sum of its proper divisors (1).

21131336741 is an equidigital number, since it uses as much as digits as its factorization.

21131336741 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 9072, while the sum is 32.

Adding to 21131336741 its reverse (14763313112), we get a palindrome (35894649853).

The spelling of 21131336741 in words is "twenty-one billion, one hundred thirty-one million, three hundred thirty-six thousand, seven hundred forty-one".