12421243424545 has 8 divisors (see below), whose sum is σ = 15022858189824. Its totient is φ = 9858750686064.

The previous prime is 12421243424543. The next prime is 12421243424581. The reversal of 12421243424545 is 54542434212421.

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 12421243424545 - 2¹ = 12421243424543 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12421243424543) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9780505999 + ... + 9780507268.

It is an arithmetic number, because the mean of its divisors is an integer number (1877857273728).

Almost surely, 2^{12421243424545} is an apocalyptic number.

It is an amenable number.

12421243424545 is a deficient number, since it is larger than the sum of its proper divisors (2601614765279).

12421243424545 is a wasteful number, since it uses less digits than its factorization.

12421243424545 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19561013399.

The product of its digits is 1228800, while the sum is 43.

Adding to 12421243424545 its reverse (54542434212421), we get a palindrome (66963677636966).

The spelling of 12421243424545 in words is "twelve trillion, four hundred twenty-one billion, two hundred forty-three million, four hundred twenty-four thousand, five hundred forty-five".