21323310313 has 2 divisors, whose sum is σ = 21323310314. Its totient is φ = 21323310312.

The previous prime is 21323310311. The next prime is 21323310343. The reversal of 21323310313 is 31301332312.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 20183032489 + 1140277824 = 142067^2 + 33768^2 .

It is a cyclic number.

It is not a de Polignac number, because 21323310313 - 2¹ = 21323310311 is a prime.

Together with 21323310311, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (21323310311) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10661655156 + 10661655157.

It is an arithmetic number, because the mean of its divisors is an integer number (10661655157).

Almost surely, 2^21323310313 is an apocalyptic number.

It is an amenable number.

21323310313 is a deficient number, since it is larger than the sum of its proper divisors (1).

21323310313 is an equidigital number, since it uses as much as digits as its factorization.

21323310313 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 972, while the sum is 22.

Adding to 21323310313 its reverse (31301332312), we get a palindrome (52624642625).

The spelling of 21323310313 in words is "twenty-one billion, three hundred twenty-three million, three hundred ten thousand, three hundred thirteen".