12420870409 has 4 divisors (see below), whose sum is σ = 12821543680. Its totient is φ = 12020197140.

The previous prime is 12420870401. The next prime is 12420870421. The reversal of 12420870409 is 90407802421.

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: 90407802421 = 2333 ⋅38751737.

It is a cyclic number.

It is not a de Polignac number, because 12420870409 - 2³ = 12420870401 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12420870401) 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, 200336589 + ... + 200336650.

It is an arithmetic number, because the mean of its divisors is an integer number (3205385920).

Almost surely, 2^12420870409 is an apocalyptic number.

It is an amenable number.

12420870409 is a deficient number, since it is larger than the sum of its proper divisors (400673271).

12420870409 is an equidigital number, since it uses as much as digits as its factorization.

12420870409 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 400673270.

The product of its (nonzero) digits is 32256, while the sum is 37.

The spelling of 12420870409 in words is "twelve billion, four hundred twenty million, eight hundred seventy thousand, four hundred nine".