12012001001 has 72 divisors (see below), whose sum is σ = 17121737664. Its totient is φ = 8182062720.

The previous prime is 12012000991. The next prime is 12012001031. The reversal of 12012001001 is 10010021021.

It is a de Polignac number, because none of the positive numbers 2^k-12012001001 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 12012001001.

It is not an unprimeable number, because it can be changed into a prime (12012001031) by changing a digit.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 4696415 + ... + 4698971.

It is an arithmetic number, because the mean of its divisors is an integer number (237801912).

Almost surely, 2^12012001001 is an apocalyptic number.

12012001001 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

12012001001 is a deficient number, since it is larger than the sum of its proper divisors (5109736663).

12012001001 is a wasteful number, since it uses less digits than its factorization.

12012001001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2639 (or 2607 counting only the distinct ones).

The product of its (nonzero) digits is 4, while the sum is 8.

Adding to 12012001001 its reverse (10010021021), we get a palindrome (22022022022).

The spelling of 12012001001 in words is "twelve billion, twelve million, one thousand, one".