12000001001 has 4 divisors (see below), whose sum is σ = 12002438532. Its totient is φ = 11997563472.

The previous prime is 12000000983. The next prime is 12000001043. The reversal of 12000001001 is 10010000021.

It is a happy number.

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 9051619600 + 2948381401 = 95140^2 + 54299^2 .

It is a cyclic number.

It is not a de Polignac number, because 12000001001 - 2³⁰ = 10926259177 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12000001051) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1211366 + ... + 1221231.

It is an arithmetic number, because the mean of its divisors is an integer number (3000609633).

Almost surely, 2^12000001001 is an apocalyptic number.

It is an amenable number.

12000001001 is a deficient number, since it is larger than the sum of its proper divisors (2437531).

12000001001 is an equidigital number, since it uses as much as digits as its factorization.

12000001001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2437530.

The product of its (nonzero) digits is 2, while the sum is 5.

Adding to 12000001001 its reverse (10010000021), we get a palindrome (22010001022).

The spelling of 12000001001 in words is "twelve billion, one thousand, one".