21411400441 has 2 divisors, whose sum is σ = 21411400442. Its totient is φ = 21411400440.

The previous prime is 21411400421. The next prime is 21411400457. The reversal of 21411400441 is 14400411412.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 17662410000 + 3748990441 = 132900^2 + 61229^2 .

It is a cyclic number.

It is not a de Polignac number, because 21411400441 - 2¹⁹ = 21410876153 is a prime.

It is not a weakly prime, because it can be changed into another prime (21411400421) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10705700220 + 10705700221.

It is an arithmetic number, because the mean of its divisors is an integer number (10705700221).

Almost surely, 2^21411400441 is an apocalyptic number.

It is an amenable number.

21411400441 is a deficient number, since it is larger than the sum of its proper divisors (1).

21411400441 is an equidigital number, since it uses as much as digits as its factorization.

21411400441 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 512, while the sum is 22.

Adding to 21411400441 its reverse (14400411412), we get a palindrome (35811811853).

The spelling of 21411400441 in words is "twenty-one billion, four hundred eleven million, four hundred thousand, four hundred forty-one".