12012002001 has 28 divisors (see below), whose sum is σ = 19069181892. Its totient is φ = 7536934656.

The previous prime is 12012001999. The next prime is 12012002021. The reversal of 12012002001 is 10020021021.

It can be written as a sum of positive squares in 2 ways, for example, as 10593349776 + 1418652225 = 102924^2 + 37665^2 .

It is not a de Polignac number, because 12012002001 - 2¹ = 12012001999 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (9).

It is not an unprimeable number, because it can be changed into a prime (12012002021) 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 27 ways as a sum of consecutive naturals, for example, 472236 + ... + 497021.

Almost surely, 2^12012002001 is an apocalyptic number.

It is an amenable number.

12012002001 is a deficient number, since it is larger than the sum of its proper divisors (7057179891).

12012002001 is an frugal number, since it uses more digits than its factorization.

12012002001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 969292 (or 969277 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 9.

Adding to 12012002001 its reverse (10020021021), we get a palindrome (22032023022).

The spelling of 12012002001 in words is "twelve billion, twelve million, two thousand, one".