2001220020001 has 4 divisors (see below), whose sum is σ = 2088229586112. Its totient is φ = 1914210453892.

The previous prime is 2001220019993. The next prime is 2001220020077. The reversal of 2001220020001 is 1000200221002.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 2001220020001 - 2³ = 2001220019993 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 2001220020001.

It is not an unprimeable number, because it can be changed into a prime (2001220020091) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 43504783021 + ... + 43504783066.

It is an arithmetic number, because the mean of its divisors is an integer number (522057396528).

Almost surely, 2^{2001220020001} is an apocalyptic number.

It is an amenable number.

2001220020001 is a deficient number, since it is larger than the sum of its proper divisors (87009566111).

2001220020001 is an equidigital number, since it uses as much as digits as its factorization.

2001220020001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 87009566110.

The product of its (nonzero) digits is 16, while the sum is 10.

Adding to 2001220020001 its reverse (1000200221002), we get a palindrome (3001420241003).

The spelling of 2001220020001 in words is "two trillion, one billion, two hundred twenty million, twenty thousand, one".