12420340042 has 32 divisors (see below), whose sum is σ = 21227365440. Its totient is φ = 5399902080.

The previous prime is 12420340021. The next prime is 12420340091. The reversal of 12420340042 is 24004302421.

It is a happy number.

12420340042 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (22).

It is a junction number, because it is equal to n+sod(n) for n = 12420339995 and 12420340022.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 81283 + ... + 177334.

It is an arithmetic number, because the mean of its divisors is an integer number (663355170).

Almost surely, 2^12420340042 is an apocalyptic number.

12420340042 is a deficient number, since it is larger than the sum of its proper divisors (8807025398).

12420340042 is a wasteful number, since it uses less digits than its factorization.

12420340042 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 258726.

The product of its (nonzero) digits is 1536, while the sum is 22.

Adding to 12420340042 its reverse (24004302421), we get a palindrome (36424642463).

The spelling of 12420340042 in words is "twelve billion, four hundred twenty million, three hundred forty thousand, forty-two".