10002001001 has 4 divisors (see below), whose sum is σ = 10004280132. Its totient is φ = 9999721872.

The previous prime is 10002000997. The next prime is 10002001003. The reversal of 10002001001 is 10010020001.

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 5737911001 + 4264090000 = 75749^2 + 65300^2 .

It is a cyclic number.

It is not a de Polignac number, because 10002001001 - 2² = 10002000997 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (10002001003) 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, 1132970 + ... + 1141763.

It is an arithmetic number, because the mean of its divisors is an integer number (2501070033).

Almost surely, 2^10002001001 is an apocalyptic number.

It is an amenable number.

10002001001 is a deficient number, since it is larger than the sum of its proper divisors (2279131).

10002001001 is an equidigital number, since it uses as much as digits as its factorization.

10002001001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2279130.

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

Adding to 10002001001 its reverse (10010020001), we get a palindrome (20012021002).

The spelling of 10002001001 in words is "ten billion, two million, one thousand, one".