21513342113 has 2 divisors, whose sum is σ = 21513342114. Its totient is φ = 21513342112.

The previous prime is 21513342091. The next prime is 21513342139. The reversal of 21513342113 is 31124331512.

It is an a-pointer prime, because the next prime (21513342139) can be obtained adding 21513342113 to its sum of digits (26).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 16417809424 + 5095532689 = 128132^2 + 71383^2 .

It is a cyclic number.

It is not a de Polignac number, because 21513342113 - 2¹⁰ = 21513341089 is a prime.

It is not a weakly prime, because it can be changed into another prime (21513342713) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10756671056 + 10756671057.

It is an arithmetic number, because the mean of its divisors is an integer number (10756671057).

Almost surely, 2^21513342113 is an apocalyptic number.

It is an amenable number.

21513342113 is a deficient number, since it is larger than the sum of its proper divisors (1).

21513342113 is an equidigital number, since it uses as much as digits as its factorization.

21513342113 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2160, while the sum is 26.

Adding to 21513342113 its reverse (31124331512), we get a palindrome (52637673625).

The spelling of 21513342113 in words is "twenty-one billion, five hundred thirteen million, three hundred forty-two thousand, one hundred thirteen".