21312440041 has 6 divisors (see below), whose sum is σ = 21904021230. Its totient is φ = 20736426816.

The previous prime is 21312439999. The next prime is 21312440161. The reversal of 21312440041 is 14004421312.

It is a happy number.

It can be written as a sum of positive squares in 3 ways, for example, as 7942374400 + 13370065641 = 89120^2 + 115629^2 .

It is not a de Polignac number, because 21312440041 - 2⁹ = 21312439529 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21312439994 and 21312440021.

It is not an unprimeable number, because it can be changed into a prime (21312441041) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 7782576 + ... + 7785313.

It is an arithmetic number, because the mean of its divisors is an integer number (3650670205).

Almost surely, 2^21312440041 is an apocalyptic number.

It is an amenable number.

21312440041 is a deficient number, since it is larger than the sum of its proper divisors (591581189).

21312440041 is an equidigital number, since it uses as much as digits as its factorization.

21312440041 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15567963 (or 15567926 counting only the distinct ones).

The product of its (nonzero) digits is 768, while the sum is 22.

Adding to 21312440041 its reverse (14004421312), we get a palindrome (35316861353).

The spelling of 21312440041 in words is "twenty-one billion, three hundred twelve million, four hundred forty thousand, forty-one".