21313202320331 has 2 divisors, whose sum is σ = 21313202320332. Its totient is φ = 21313202320330.

The previous prime is 21313202320313. The next prime is 21313202320349. The reversal of 21313202320331 is 13302320231312.

Together with previous prime (21313202320313) it forms an Ormiston pair, because they use the same digits, order apart.

It is a balanced prime because it is at equal distance from previous prime (21313202320313) and next prime (21313202320349).

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21313202320331 is a prime.

It is a super-2 number, since 2×21313202320331² (a number of 27 digits) contains 22 as substring.

It is a Sophie Germain prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21313202320331.

It is not a weakly prime, because it can be changed into another prime (21313202320301) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10656601160165 + 10656601160166.

It is an arithmetic number, because the mean of its divisors is an integer number (10656601160166).

Almost surely, 2^{21313202320331} is an apocalyptic number.

21313202320331 is a deficient number, since it is larger than the sum of its proper divisors (1).

21313202320331 is an equidigital number, since it uses as much as digits as its factorization.

21313202320331 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3888, while the sum is 26.

Adding to 21313202320331 its reverse (13302320231312), we get a palindrome (34615522551643).

The spelling of 21313202320331 in words is "twenty-one trillion, three hundred thirteen billion, two hundred two million, three hundred twenty thousand, three hundred thirty-one".