12429347621 has 4 divisors (see below), whose sum is σ = 12435475500. Its totient is φ = 12423219744.

The previous prime is 12429347603. The next prime is 12429347647. The reversal of 12429347621 is 12674392421.

12429347621 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.

It can be written as a sum of positive squares in 2 ways, for example, as 6895475521 + 5533872100 = 83039^2 + 74390^2 .

It is a cyclic number.

It is not a de Polignac number, because 12429347621 - 2¹⁴ = 12429331237 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 (12429347321) 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, 3060896 + ... + 3064953.

It is an arithmetic number, because the mean of its divisors is an integer number (3108868875).

Almost surely, 2^12429347621 is an apocalyptic number.

It is an amenable number.

12429347621 is a deficient number, since it is larger than the sum of its proper divisors (6127879).

12429347621 is an equidigital number, since it uses as much as digits as its factorization.

12429347621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6127878.

The product of its digits is 145152, while the sum is 41.

The spelling of 12429347621 in words is "twelve billion, four hundred twenty-nine million, three hundred forty-seven thousand, six hundred twenty-one".