21313200311317 has 2 divisors, whose sum is σ = 21313200311318. Its totient is φ = 21313200311316.

The previous prime is 21313200311203. The next prime is 21313200311321. The reversal of 21313200311317 is 71311300231312.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 19498591949841 + 1814608361476 = 4415721^2 + 1347074^2 .

It is a cyclic number.

It is not a de Polignac number, because 21313200311317 - 2⁷ = 21313200311189 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21313200311017) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10656600155658 + 10656600155659.

It is an arithmetic number, because the mean of its divisors is an integer number (10656600155659).

Almost surely, 2^{21313200311317} is an apocalyptic number.

It is an amenable number.

21313200311317 is a deficient number, since it is larger than the sum of its proper divisors (1).

21313200311317 is an equidigital number, since it uses as much as digits as its factorization.

21313200311317 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2268, while the sum is 28.

Adding to 21313200311317 its reverse (71311300231312), we get a palindrome (92624500542629).

The spelling of 21313200311317 in words is "twenty-one trillion, three hundred thirteen billion, two hundred million, three hundred eleven thousand, three hundred seventeen".