2001220012001 has 16 divisors (see below), whose sum is σ = 2321417379840. Its totient is φ = 1689603656400.

The previous prime is 2001220011983. The next prime is 2001220012013. The reversal of 2001220012001 is 1002100221002.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 2001220012001 - 2⁶ = 2001220011937 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (2001220012021) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6438080 + ... + 6741758.

It is an arithmetic number, because the mean of its divisors is an integer number (145088586240).

Almost surely, 2^{2001220012001} is an apocalyptic number.

It is an amenable number.

2001220012001 is a deficient number, since it is larger than the sum of its proper divisors (320197367839).

2001220012001 is a wasteful number, since it uses less digits than its factorization.

2001220012001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 317804.

The product of its (nonzero) digits is 16, while the sum is 11.

Adding to 2001220012001 its reverse (1002100221002), we get a palindrome (3003320233003).

The spelling of 2001220012001 in words is "two trillion, one billion, two hundred twenty million, twelve thousand, one".