12631019021 has 4 divisors (see below), whose sum is σ = 12640896000. Its totient is φ = 12621142044.

The previous prime is 12631018993. The next prime is 12631019039. The reversal of 12631019021 is 12091013621.

12631019021 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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: 12091013621 = 241 ⋅50170181.

It is a cyclic number.

It is not a de Polignac number, because 12631019021 - 2³⁰ = 11557277197 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12631012021) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4936571 + ... + 4939128.

It is an arithmetic number, because the mean of its divisors is an integer number (3160224000).

Almost surely, 2^12631019021 is an apocalyptic number.

It is an amenable number.

12631019021 is a deficient number, since it is larger than the sum of its proper divisors (9876979).

12631019021 is an equidigital number, since it uses as much as digits as its factorization.

12631019021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9876978.

The product of its (nonzero) digits is 648, while the sum is 26.

The spelling of 12631019021 in words is "twelve billion, six hundred thirty-one million, nineteen thousand, twenty-one".