12118413521 has 4 divisors (see below), whose sum is σ = 12119994432. Its totient is φ = 12116832612.

The previous prime is 12118413497. The next prime is 12118413523. The reversal of 12118413521 is 12531481121.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 12118413521 - 2⁶ = 12118413457 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12118413523) 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 in 3 ways as a sum of consecutive naturals, for example, 778901 + ... + 794306.

It is an arithmetic number, because the mean of its divisors is an integer number (3029998608).

Almost surely, 2^12118413521 is an apocalyptic number.

It is an amenable number.

12118413521 is a deficient number, since it is larger than the sum of its proper divisors (1580911).

12118413521 is an equidigital number, since it uses as much as digits as its factorization.

12118413521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1580910.

The product of its digits is 1920, while the sum is 29.

Adding to 12118413521 its reverse (12531481121), we get a palindrome (24649894642).

The spelling of 12118413521 in words is "twelve billion, one hundred eighteen million, four hundred thirteen thousand, five hundred twenty-one".