12127258421 has 4 divisors (see below), whose sum is σ = 12765535200. Its totient is φ = 11488981644.

The previous prime is 12127258411. The next prime is 12127258469. The reversal of 12127258421 is 12485272121.

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.

It is a cyclic number.

It is not a de Polignac number, because 12127258421 - 2¹⁰ = 12127257397 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12127258411) 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, 319138361 + ... + 319138398.

It is an arithmetic number, because the mean of its divisors is an integer number (3191383800).

Almost surely, 2^12127258421 is an apocalyptic number.

It is an amenable number.

12127258421 is a deficient number, since it is larger than the sum of its proper divisors (638276779).

12127258421 is an equidigital number, since it uses as much as digits as its factorization.

12127258421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 638276778.

The product of its digits is 17920, while the sum is 35.

The spelling of 12127258421 in words is "twelve billion, one hundred twenty-seven million, two hundred fifty-eight thousand, four hundred twenty-one".