12420111243 has 8 divisors (see below), whose sum is σ = 17534274768. Its totient is φ = 7793010944.

The previous prime is 12420111227. The next prime is 12420111283. The reversal of 12420111243 is 34211102421.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 12420111243 - 2⁴ = 12420111227 is a prime.

It is not an unprimeable number, because it can be changed into a prime (12420111283) 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 7 ways as a sum of consecutive naturals, for example, 121765746 + ... + 121765847.

It is an arithmetic number, because the mean of its divisors is an integer number (2191784346).

Almost surely, 2^12420111243 is an apocalyptic number.

12420111243 is a deficient number, since it is larger than the sum of its proper divisors (5114163525).

12420111243 is a wasteful number, since it uses less digits than its factorization.

12420111243 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 243531613.

The product of its (nonzero) digits is 384, while the sum is 21.

Adding to 12420111243 its reverse (34211102421), we get a palindrome (46631213664).

The spelling of 12420111243 in words is "twelve billion, four hundred twenty million, one hundred eleven thousand, two hundred forty-three".