21041440241 has 2 divisors, whose sum is σ = 21041440242. Its totient is φ = 21041440240.

The previous prime is 21041440213. The next prime is 21041440283. The reversal of 21041440241 is 14204414012.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 20852515216 + 188925025 = 144404^2 + 13745^2 .

It is a cyclic number.

It is not a de Polignac number, because 21041440241 - 2¹⁸ = 21041178097 is a prime.

It is not a weakly prime, because it can be changed into another prime (21041440291) 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, 10520720120 + 10520720121.

It is an arithmetic number, because the mean of its divisors is an integer number (10520720121).

Almost surely, 2^21041440241 is an apocalyptic number.

It is an amenable number.

21041440241 is a deficient number, since it is larger than the sum of its proper divisors (1).

21041440241 is an equidigital number, since it uses as much as digits as its factorization.

21041440241 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1024, while the sum is 23.

Adding to 21041440241 its reverse (14204414012), we get a palindrome (35245854253).

The spelling of 21041440241 in words is "twenty-one billion, forty-one million, four hundred forty thousand, two hundred forty-one".