21130108313 has 2 divisors, whose sum is σ = 21130108314. Its totient is φ = 21130108312.

The previous prime is 21130108291. The next prime is 21130108339. The reversal of 21130108313 is 31380103112.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 17346997264 + 3783111049 = 131708^2 + 61507^2 .

It is a cyclic number.

It is not a de Polignac number, because 21130108313 - 2⁸ = 21130108057 is a prime.

It is a super-2 number, since 2×21130108313² (a number of 21 digits) contains 22 as substring.

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 (21130108913) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10565054156 + 10565054157.

It is an arithmetic number, because the mean of its divisors is an integer number (10565054157).

Almost surely, 2^21130108313 is an apocalyptic number.

It is an amenable number.

21130108313 is a deficient number, since it is larger than the sum of its proper divisors (1).

21130108313 is an equidigital number, since it uses as much as digits as its factorization.

21130108313 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 432, while the sum is 23.

The spelling of 21130108313 in words is "twenty-one billion, one hundred thirty million, one hundred eight thousand, three hundred thirteen".