12421644361 has 4 divisors (see below), whose sum is σ = 14196164992. Its totient is φ = 10647123732.

The previous prime is 12421644349. The next prime is 12421644377. The reversal of 12421644361 is 16344612421.

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 not a de Polignac number, because 12421644361 - 2⁹ = 12421643849 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12421644311) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 887260305 + ... + 887260318.

It is an arithmetic number, because the mean of its divisors is an integer number (3549041248).

Almost surely, 2^12421644361 is an apocalyptic number.

It is an amenable number.

12421644361 is a deficient number, since it is larger than the sum of its proper divisors (1774520631).

12421644361 is an equidigital number, since it uses as much as digits as its factorization.

12421644361 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1774520630.

The product of its digits is 27648, while the sum is 34.

The spelling of 12421644361 in words is "twelve billion, four hundred twenty-one million, six hundred forty-four thousand, three hundred sixty-one".