21310231013 has 2 divisors, whose sum is σ = 21310231014. Its totient is φ = 21310231012.

The previous prime is 21310230967. The next prime is 21310231021. The reversal of 21310231013 is 31013201312.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 11587876609 + 9722354404 = 107647^2 + 98602^2 .

It is a cyclic number.

It is not a de Polignac number, because 21310231013 - 2¹⁰ = 21310229989 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21310230982 and 21310231000.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21310231093) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10655115506 + 10655115507.

It is an arithmetic number, because the mean of its divisors is an integer number (10655115507).

Almost surely, 2^21310231013 is an apocalyptic number.

It is an amenable number.

21310231013 is a deficient number, since it is larger than the sum of its proper divisors (1).

21310231013 is an equidigital number, since it uses as much as digits as its factorization.

21310231013 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 108, while the sum is 17.

Adding to 21310231013 its reverse (31013201312), we get a palindrome (52323432325).

The spelling of 21310231013 in words is "twenty-one billion, three hundred ten million, two hundred thirty-one thousand, thirteen".