2001022221201 has 4 divisors (see below), whose sum is σ = 2668029628272. Its totient is φ = 1334014814132.

The previous prime is 2001022221193. The next prime is 2001022221203. The reversal of 2001022221201 is 1021222201002.

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 2001022221201 - 2³ = 2001022221193 is a prime.

It is not an unprimeable number, because it can be changed into a prime (2001022221203) 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, 333503703531 + ... + 333503703536.

It is an arithmetic number, because the mean of its divisors is an integer number (667007407068).

Almost surely, 2^{2001022221201} is an apocalyptic number.

It is an amenable number.

2001022221201 is a deficient number, since it is larger than the sum of its proper divisors (667007407071).

2001022221201 is an equidigital number, since it uses as much as digits as its factorization.

2001022221201 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 667007407070.

The product of its (nonzero) digits is 64, while the sum is 15.

Adding to 2001022221201 its reverse (1021222201002), we get a palindrome (3022244422203).

The spelling of 2001022221201 in words is "two trillion, one billion, twenty-two million, two hundred twenty-one thousand, two hundred one".