113215013521 has 2 divisors, whose sum is σ = 113215013522. Its totient is φ = 113215013520.

The previous prime is 113215013519. The next prime is 113215013533. The reversal of 113215013521 is 125310512311.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 72102990400 + 41112023121 = 268520^2 + 202761^2 .

It is a cyclic number.

It is not a de Polignac number, because 113215013521 - 2¹ = 113215013519 is a prime.

Together with 113215013519, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (113215013591) 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, 56607506760 + 56607506761.

It is an arithmetic number, because the mean of its divisors is an integer number (56607506761).

Almost surely, 2^113215013521 is an apocalyptic number.

It is an amenable number.

113215013521 is a deficient number, since it is larger than the sum of its proper divisors (1).

113215013521 is an equidigital number, since it uses as much as digits as its factorization.

113215013521 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 900, while the sum is 25.

Adding to 113215013521 its reverse (125310512311), we get a palindrome (238525525832).

The spelling of 113215013521 in words is "one hundred thirteen billion, two hundred fifteen million, thirteen thousand, five hundred twenty-one".