12454251421 has 2 divisors, whose sum is σ = 12454251422. Its totient is φ = 12454251420.

The previous prime is 12454251419. The next prime is 12454251427. The reversal of 12454251421 is 12415245421.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 12147125796 + 307125625 = 110214^2 + 17525^2 .

It is an emirp because it is prime and its reverse (12415245421) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 12454251421 - 2¹ = 12454251419 is a prime.

Together with 12454251419, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12454251427) 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 as a sum of consecutive naturals, namely, 6227125710 + 6227125711.

It is an arithmetic number, because the mean of its divisors is an integer number (6227125711).

Almost surely, 2^12454251421 is an apocalyptic number.

It is an amenable number.

12454251421 is a deficient number, since it is larger than the sum of its proper divisors (1).

12454251421 is an equidigital number, since it uses as much as digits as its factorization.

12454251421 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 12800, while the sum is 31.

Adding to 12454251421 its reverse (12415245421), we get a palindrome (24869496842).

The spelling of 12454251421 in words is "twelve billion, four hundred fifty-four million, two hundred fifty-one thousand, four hundred twenty-one".