12862421521 has 4 divisors (see below), whose sum is σ = 13136090112. Its totient is φ = 12588752932.

The previous prime is 12862421501. The next prime is 12862421531. The reversal of 12862421521 is 12512426821.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 12512426821 = 227 ⋅55120823.

It is a cyclic number.

It is not a de Polignac number, because 12862421521 - 2¹⁷ = 12862290449 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12862421501) 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, 136834225 + ... + 136834318.

It is an arithmetic number, because the mean of its divisors is an integer number (3284022528).

Almost surely, 2^12862421521 is an apocalyptic number.

It is an amenable number.

12862421521 is a deficient number, since it is larger than the sum of its proper divisors (273668591).

12862421521 is an equidigital number, since it uses as much as digits as its factorization.

12862421521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 273668590.

The product of its digits is 15360, while the sum is 34.

The spelling of 12862421521 in words is "twelve billion, eight hundred sixty-two million, four hundred twenty-one thousand, five hundred twenty-one".