21324310313 has 2 divisors, whose sum is σ = 21324310314. Its totient is φ = 21324310312.

The previous prime is 21324310297. The next prime is 21324310333. The reversal of 21324310313 is 31301342312.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 12925870864 + 8398439449 = 113692^2 + 91643^2 .

It is a cyclic number.

It is not a de Polignac number, because 21324310313 - 2⁴ = 21324310297 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (21324310333) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10662155156 + 10662155157.

It is an arithmetic number, because the mean of its divisors is an integer number (10662155157).

Almost surely, 2^21324310313 is an apocalyptic number.

It is an amenable number.

21324310313 is a deficient number, since it is larger than the sum of its proper divisors (1).

21324310313 is an equidigital number, since it uses as much as digits as its factorization.

21324310313 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1296, while the sum is 23.

Adding to 21324310313 its reverse (31301342312), we get a palindrome (52625652625).

The spelling of 21324310313 in words is "twenty-one billion, three hundred twenty-four million, three hundred ten thousand, three hundred thirteen".