21336313841 has 2 divisors, whose sum is σ = 21336313842. Its totient is φ = 21336313840.

The previous prime is 21336313799. The next prime is 21336313861. The reversal of 21336313841 is 14831363312.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 11492697616 + 9843616225 = 107204^2 + 99215^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21336313841 is a prime.

It is not a weakly prime, because it can be changed into another prime (21336313861) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10668156920 + 10668156921.

It is an arithmetic number, because the mean of its divisors is an integer number (10668156921).

Almost surely, 2^21336313841 is an apocalyptic number.

It is an amenable number.

21336313841 is a deficient number, since it is larger than the sum of its proper divisors (1).

21336313841 is an equidigital number, since it uses as much as digits as its factorization.

21336313841 is an evil number, because the sum of its binary digits is even.

The product of its digits is 31104, while the sum is 35.

The spelling of 21336313841 in words is "twenty-one billion, three hundred thirty-six million, three hundred thirteen thousand, eight hundred forty-one".