12583421329421 has 2 divisors, whose sum is σ = 12583421329422. Its totient is φ = 12583421329420.

The previous prime is 12583421329379. The next prime is 12583421329477. The reversal of 12583421329421 is 12492312438521.

It is a happy number.

12583421329421 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 11496093766921 + 1087327562500 = 3390589^2 + 1042750^2 .

It is a cyclic number.

It is not a de Polignac number, because 12583421329421 - 2¹⁰ = 12583421328397 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12583421329321) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6291710664710 + 6291710664711.

It is an arithmetic number, because the mean of its divisors is an integer number (6291710664711).

Almost surely, 2^{12583421329421} is an apocalyptic number.

It is an amenable number.

12583421329421 is a deficient number, since it is larger than the sum of its proper divisors (1).

12583421329421 is an equidigital number, since it uses as much as digits as its factorization.

12583421329421 is an evil number, because the sum of its binary digits is even.

The product of its digits is 829440, while the sum is 47.

The spelling of 12583421329421 in words is "twelve trillion, five hundred eighty-three billion, four hundred twenty-one million, three hundred twenty-nine thousand, four hundred twenty-one".