12002001001 has 4 divisors (see below), whose sum is σ = 12048701652. Its totient is φ = 11955300352.

The previous prime is 12002000863. The next prime is 12002001007. The reversal of 12002001001 is 10010020021.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 10010020021 = 19 ⋅526843159.

It can be written as a sum of positive squares in 2 ways, for example, as 8775192976 + 3226808025 = 93676^2 + 56805^2 .

It is a cyclic number.

It is not a de Polignac number, because 12002001001 - 2⁹ = 12002000489 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12002001007) 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, 23349940 + ... + 23350453.

It is an arithmetic number, because the mean of its divisors is an integer number (3012175413).

Almost surely, 2^12002001001 is an apocalyptic number.

It is an amenable number.

12002001001 is a deficient number, since it is larger than the sum of its proper divisors (46700651).

12002001001 is an equidigital number, since it uses as much as digits as its factorization.

12002001001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 46700650.

The product of its (nonzero) digits is 4, while the sum is 7.

Adding to 12002001001 its reverse (10010020021), we get a palindrome (22012021022).

The spelling of 12002001001 in words is "twelve billion, two million, one thousand, one".