21043460041 has 4 divisors (see below), whose sum is σ = 21045994900. Its totient is φ = 21040925184.

The previous prime is 21043460023. The next prime is 21043460063. The reversal of 21043460041 is 14006434012.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 5329584016 + 15713876025 = 73004^2 + 125355^2 .

It is a cyclic number.

It is not a de Polignac number, because 21043460041 - 2²⁷ = 20909242313 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21043459988 and 21043460015.

It is not an unprimeable number, because it can be changed into a prime (21043400041) 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 in 3 ways as a sum of consecutive naturals, for example, 1254936 + ... + 1271593.

It is an arithmetic number, because the mean of its divisors is an integer number (5261498725).

Almost surely, 2^21043460041 is an apocalyptic number.

It is an amenable number.

21043460041 is a deficient number, since it is larger than the sum of its proper divisors (2534859).

21043460041 is an equidigital number, since it uses as much as digits as its factorization.

21043460041 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2534858.

The product of its (nonzero) digits is 2304, while the sum is 25.

Adding to 21043460041 its reverse (14006434012), we get a palindrome (35049894053).

The spelling of 21043460041 in words is "twenty-one billion, forty-three million, four hundred sixty thousand, forty-one".