12181000427 has 4 divisors (see below), whose sum is σ = 12261669456. Its totient is φ = 12100331400.

The previous prime is 12181000423. The next prime is 12181000451. The reversal of 12181000427 is 72400018121.

12181000427 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is a cyclic number.

It is not a de Polignac number, because 12181000427 - 2² = 12181000423 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 12181000396 and 12181000405.

It is not an unprimeable number, because it can be changed into a prime (12181000421) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 40334288 + ... + 40334589.

It is an arithmetic number, because the mean of its divisors is an integer number (3065417364).

Almost surely, 2^12181000427 is an apocalyptic number.

12181000427 is a deficient number, since it is larger than the sum of its proper divisors (80669029).

12181000427 is an equidigital number, since it uses as much as digits as its factorization.

12181000427 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 80669028.

The product of its (nonzero) digits is 896, while the sum is 26.

Adding to 12181000427 its reverse (72400018121), we get a palindrome (84581018548).

The spelling of 12181000427 in words is "twelve billion, one hundred eighty-one million, four hundred twenty-seven", and thus it is an aban number.