113313020521 has 4 divisors (see below), whose sum is σ = 113565388500. Its totient is φ = 113060652544.

The previous prime is 113313020473. The next prime is 113313020531. The reversal of 113313020521 is 125020313311.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 125020313311 = 827 ⋅151173293.

It can be written as a sum of positive squares in 2 ways, for example, as 65325736921 + 47987283600 = 255589^2 + 219060^2 .

It is a cyclic number.

It is not a de Polignac number, because 113313020521 - 2¹¹ = 113313018473 is a prime.

It is a super-2 number, since 2×113313020521² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 113313020492 and 113313020501.

It is not an unprimeable number, because it can be changed into a prime (113313020531) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 126183316 + ... + 126184213.

It is an arithmetic number, because the mean of its divisors is an integer number (28391347125).

Almost surely, 2^113313020521 is an apocalyptic number.

It is an amenable number.

113313020521 is a deficient number, since it is larger than the sum of its proper divisors (252367979).

113313020521 is an equidigital number, since it uses as much as digits as its factorization.

113313020521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 252367978.

The product of its (nonzero) digits is 540, while the sum is 22.

Adding to 113313020521 its reverse (125020313311), we get a palindrome (238333333832).

The spelling of 113313020521 in words is "one hundred thirteen billion, three hundred thirteen million, twenty thousand, five hundred twenty-one".