12436863421 has 4 divisors (see below), whose sum is σ = 13091435200. Its totient is φ = 11782291644.

The previous prime is 12436863401. The next prime is 12436863443.

12436863421 is nontrivially palindromic in base 10.

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 12436863421 - 2¹⁷ = 12436732349 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 (12436863401) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 327285861 + ... + 327285898.

It is an arithmetic number, because the mean of its divisors is an integer number (3272858800).

Almost surely, 2^12436863421 is an apocalyptic number.

It is an amenable number.

12436863421 is a deficient number, since it is larger than the sum of its proper divisors (654571779).

12436863421 is an equidigital number, since it uses as much as digits as its factorization.

12436863421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 654571778.

The product of its digits is 165888, while the sum is 40.

The spelling of 12436863421 in words is "twelve billion, four hundred thirty-six million, eight hundred sixty-three thousand, four hundred twenty-one".