21103303841 has 2 divisors, whose sum is σ = 21103303842. Its totient is φ = 21103303840.

The previous prime is 21103303811. The next prime is 21103303849. The reversal of 21103303841 is 14830330112.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 20908003216 + 195300625 = 144596^2 + 13975^2 .

It is a cyclic number.

It is not a de Polignac number, because 21103303841 - 2⁶ = 21103303777 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21103303841.

It is not a weakly prime, because it can be changed into another prime (21103303849) 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, 10551651920 + 10551651921.

It is an arithmetic number, because the mean of its divisors is an integer number (10551651921).

Almost surely, 2^21103303841 is an apocalyptic number.

It is an amenable number.

21103303841 is a deficient number, since it is larger than the sum of its proper divisors (1).

21103303841 is an equidigital number, since it uses as much as digits as its factorization.

21103303841 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1728, while the sum is 26.

Adding to 21103303841 its reverse (14830330112), we get a palindrome (35933633953).

The spelling of 21103303841 in words is "twenty-one billion, one hundred three million, three hundred three thousand, eight hundred forty-one".