12421255451243 has 4 divisors (see below), whose sum is σ = 12423025119960. Its totient is φ = 12419485782528.

The previous prime is 12421255451221. The next prime is 12421255451303. The reversal of 12421255451243 is 34215455212421.

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

It is a cyclic number.

It is not a de Polignac number, because 12421255451243 - 2³⁸ = 12146377544299 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 12421255451243.

It is not an unprimeable number, because it can be changed into a prime (12421255471243) 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 3 ways as a sum of consecutive naturals, for example, 884823830 + ... + 884837867.

It is an arithmetic number, because the mean of its divisors is an integer number (3105756279990).

Almost surely, 2^{12421255451243} is an apocalyptic number.

12421255451243 is a deficient number, since it is larger than the sum of its proper divisors (1769668717).

12421255451243 is an equidigital number, since it uses as much as digits as its factorization.

12421255451243 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1769668716.

The product of its digits is 384000, while the sum is 41.

The spelling of 12421255451243 in words is "twelve trillion, four hundred twenty-one billion, two hundred fifty-five million, four hundred fifty-one thousand, two hundred forty-three".