12420227138 has 16 divisors (see below), whose sum is σ = 20348732736. Its totient is φ = 5638689840.

The previous prime is 12420227137. The next prime is 12420227143. The reversal of 12420227138 is 83172202421.

It is not an unprimeable number, because it can be changed into a prime (12420227137) 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 7 ways as a sum of consecutive naturals, for example, 324881 + ... + 361092.

It is an arithmetic number, because the mean of its divisors is an integer number (1271795796).

Almost surely, 2^12420227138 is an apocalyptic number.

12420227138 is a deficient number, since it is larger than the sum of its proper divisors (7928505598).

12420227138 is a wasteful number, since it uses less digits than its factorization.

12420227138 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 686809.

The product of its (nonzero) digits is 10752, while the sum is 32.

Adding to 12420227138 its reverse (83172202421), we get a palindrome (95592429559).

The spelling of 12420227138 in words is "twelve billion, four hundred twenty million, two hundred twenty-seven thousand, one hundred thirty-eight".