21312303013 has 2 divisors, whose sum is σ = 21312303014. Its totient is φ = 21312303012.

The previous prime is 21312303007. The next prime is 21312303043. The reversal of 21312303013 is 31030321312.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 19734068484 + 1578234529 = 140478^2 + 39727^2 .

It is a cyclic number.

It is not a de Polignac number, because 21312303013 - 2⁵ = 21312302981 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21312303043) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10656151506 + 10656151507.

It is an arithmetic number, because the mean of its divisors is an integer number (10656151507).

Almost surely, 2^21312303013 is an apocalyptic number.

It is an amenable number.

21312303013 is a deficient number, since it is larger than the sum of its proper divisors (1).

21312303013 is an equidigital number, since it uses as much as digits as its factorization.

21312303013 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 19.

Adding to 21312303013 its reverse (31030321312), we get a palindrome (52342624325).

The spelling of 21312303013 in words is "twenty-one billion, three hundred twelve million, three hundred three thousand, thirteen".