21404505041441 has 2 divisors, whose sum is σ = 21404505041442. Its totient is φ = 21404505041440.

The previous prime is 21404505041401. The next prime is 21404505041519. The reversal of 21404505041441 is 14414050540412.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 19679692992400 + 1724812049041 = 4436180^2 + 1313321^2 .

It is a cyclic number.

It is not a de Polignac number, because 21404505041441 - 2¹⁰ = 21404505040417 is a prime.

It is not a weakly prime, because it can be changed into another prime (21404505041401) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10702252520720 + 10702252520721.

It is an arithmetic number, because the mean of its divisors is an integer number (10702252520721).

Almost surely, 2^{21404505041441} is an apocalyptic number.

It is an amenable number.

21404505041441 is a deficient number, since it is larger than the sum of its proper divisors (1).

21404505041441 is an equidigital number, since it uses as much as digits as its factorization.

21404505041441 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 51200, while the sum is 35.

Adding to 21404505041441 its reverse (14414050540412), we get a palindrome (35818555581853).

The spelling of 21404505041441 in words is "twenty-one trillion, four hundred four billion, five hundred five million, forty-one thousand, four hundred forty-one".