12400128001 has 4 divisors (see below), whose sum is σ = 12414564400. Its totient is φ = 12385691604.

The previous prime is 12400127983. The next prime is 12400128011. The reversal of 12400128001 is 10082100421.

It is a happy number.

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 a de Polignac number, because none of the positive numbers 2^k-12400128001 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 12400128001.

It is not an unprimeable number, because it can be changed into a prime (12400128011) 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, 7216911 + ... + 7218628.

It is an arithmetic number, because the mean of its divisors is an integer number (3103641100).

Almost surely, 2^12400128001 is an apocalyptic number.

It is an amenable number.

12400128001 is a deficient number, since it is larger than the sum of its proper divisors (14436399).

12400128001 is an equidigital number, since it uses as much as digits as its factorization.

12400128001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14436398.

The product of its (nonzero) digits is 128, while the sum is 19.

Adding to 12400128001 its reverse (10082100421), we get a palindrome (22482228422).

The spelling of 12400128001 in words is "twelve billion, four hundred million, one hundred twenty-eight thousand, one".