113554043124521 has 4 divisors (see below), whose sum is σ = 115696572240132. Its totient is φ = 111411514008912.

The previous prime is 113554043124491. The next prime is 113554043124527. The reversal of 113554043124521 is 125421340455311.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 89235228673600 + 24318814450921 = 9446440^2 + 4931411^2 .

It is not a de Polignac number, because 113554043124521 - 2¹⁰ = 113554043123497 is a prime.

It is a super-2 number, since 2×113554043124521² (a number of 29 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (113554043124527) 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, 1071264557726 + ... + 1071264557831.

It is an arithmetic number, because the mean of its divisors is an integer number (28924143060033).

Almost surely, 2^{113554043124521} is an apocalyptic number.

It is an amenable number.

113554043124521 is a deficient number, since it is larger than the sum of its proper divisors (2142529115611).

113554043124521 is an equidigital number, since it uses as much as digits as its factorization.

113554043124521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2142529115610.

The product of its (nonzero) digits is 288000, while the sum is 41.

Adding to 113554043124521 its reverse (125421340455311), we get a palindrome (238975383579832).

The spelling of 113554043124521 in words is "one hundred thirteen trillion, five hundred fifty-four billion, forty-three million, one hundred twenty-four thousand, five hundred twenty-one".