113534211521 has 4 divisors (see below), whose sum is σ = 113538524100. Its totient is φ = 113529898944.

The previous prime is 113534211503. The next prime is 113534211547. The reversal of 113534211521 is 125112435311.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 125112435311 = 53 ⋅2360611987.

It can be written as a sum of positive squares in 2 ways, for example, as 36572355121 + 76961856400 = 191239^2 + 277420^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-113534211521 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (113534219521) 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 in 3 ways as a sum of consecutive naturals, for example, 2116556 + ... + 2169533.

It is an arithmetic number, because the mean of its divisors is an integer number (28384631025).

Almost surely, 2^113534211521 is an apocalyptic number.

It is an amenable number.

113534211521 is a deficient number, since it is larger than the sum of its proper divisors (4312579).

113534211521 is an equidigital number, since it uses as much as digits as its factorization.

113534211521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4312578.

The product of its digits is 3600, while the sum is 29.

Adding to 113534211521 its reverse (125112435311), we get a palindrome (238646646832).

The spelling of 113534211521 in words is "one hundred thirteen billion, five hundred thirty-four million, two hundred eleven thousand, five hundred twenty-one".