21311411243 has 2 divisors, whose sum is σ = 21311411244. Its totient is φ = 21311411242.

The previous prime is 21311411227. The next prime is 21311411269. The reversal of 21311411243 is 34211411312.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21311411243 - 2⁴ = 21311411227 is a prime.

It is not a weakly prime, because it can be changed into another prime (21311411273) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10655705621 + 10655705622.

It is an arithmetic number, because the mean of its divisors is an integer number (10655705622).

Almost surely, 2^21311411243 is an apocalyptic number.

21311411243 is a deficient number, since it is larger than the sum of its proper divisors (1).

21311411243 is an equidigital number, since it uses as much as digits as its factorization.

21311411243 is an evil number, because the sum of its binary digits is even.

The product of its digits is 576, while the sum is 23.

Adding to 21311411243 its reverse (34211411312), we get a palindrome (55522822555).

The spelling of 21311411243 in words is "twenty-one billion, three hundred eleven million, four hundred eleven thousand, two hundred forty-three".