12420243145 has 4 divisors (see below), whose sum is σ = 14904291780. Its totient is φ = 9936194512.

The previous prime is 12420243091. The next prime is 12420243151. The reversal of 12420243145 is 54134202421.

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

It can be written as a sum of positive squares in 2 ways, for example, as 6153304249 + 6266938896 = 78443^2 + 79164^2 .

It is a cyclic number.

It is not a de Polignac number, because 12420243145 - 2²³ = 12411854537 is a prime.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 1242024310 + ... + 1242024319.

It is an arithmetic number, because the mean of its divisors is an integer number (3726072945).

Almost surely, 2^12420243145 is an apocalyptic number.

It is an amenable number.

12420243145 is a deficient number, since it is larger than the sum of its proper divisors (2484048635).

12420243145 is an equidigital number, since it uses as much as digits as its factorization.

12420243145 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2484048634.

The product of its (nonzero) digits is 7680, while the sum is 28.

Adding to 12420243145 its reverse (54134202421), we get a palindrome (66554445566).

The spelling of 12420243145 in words is "twelve billion, four hundred twenty million, two hundred forty-three thousand, one hundred forty-five".