21231130313 has 2 divisors, whose sum is σ = 21231130314. Its totient is φ = 21231130312.

The previous prime is 21231130241. The next prime is 21231130343. The reversal of 21231130313 is 31303113212.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 12249398329 + 8981731984 = 110677^2 + 94772^2 .

It is a cyclic number.

It is not a de Polignac number, because 21231130313 - 2¹⁰ = 21231129289 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 (21231130343) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10615565156 + 10615565157.

It is an arithmetic number, because the mean of its divisors is an integer number (10615565157).

Almost surely, 2^21231130313 is an apocalyptic number.

It is an amenable number.

21231130313 is a deficient number, since it is larger than the sum of its proper divisors (1).

21231130313 is an equidigital number, since it uses as much as digits as its factorization.

21231130313 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 324, while the sum is 20.

Adding to 21231130313 its reverse (31303113212), we get a palindrome (52534243525).

The spelling of 21231130313 in words is "twenty-one billion, two hundred thirty-one million, one hundred thirty thousand, three hundred thirteen".