113513867921 has 2 divisors, whose sum is σ = 113513867922. Its totient is φ = 113513867920.

The previous prime is 113513867897. The next prime is 113513867939. The reversal of 113513867921 is 129768315311.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 111225585025 + 2288282896 = 333505^2 + 47836^2 .

It is an emirp because it is prime and its reverse (129768315311) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 113513867921 - 2¹⁰ = 113513866897 is a prime.

It is not a weakly prime, because it can be changed into another prime (113513867981) 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, 56756933960 + 56756933961.

It is an arithmetic number, because the mean of its divisors is an integer number (56756933961).

Almost surely, 2^113513867921 is an apocalyptic number.

It is an amenable number.

113513867921 is a deficient number, since it is larger than the sum of its proper divisors (1).

113513867921 is an equidigital number, since it uses as much as digits as its factorization.

113513867921 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 272160, while the sum is 47.

The spelling of 113513867921 in words is "one hundred thirteen billion, five hundred thirteen million, eight hundred sixty-seven thousand, nine hundred twenty-one".