2001201022221 has 4 divisors (see below), whose sum is σ = 2668268029632. Its totient is φ = 1334134014812.

The previous prime is 2001201022193. The next prime is 2001201022273. The reversal of 2001201022221 is 1222201021002.

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 2001201022221 - 2¹⁵ = 2001200989453 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 2001201022221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2001201022321) 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, 333533503701 + ... + 333533503706.

It is an arithmetic number, because the mean of its divisors is an integer number (667067007408).

Almost surely, 2^{2001201022221} is an apocalyptic number.

It is an amenable number.

2001201022221 is a deficient number, since it is larger than the sum of its proper divisors (667067007411).

2001201022221 is an equidigital number, since it uses as much as digits as its factorization.

2001201022221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 667067007410.

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

Adding to 2001201022221 its reverse (1222201021002), we get a palindrome (3223402043223).

The spelling of 2001201022221 in words is "two trillion, one billion, two hundred one million, twenty-two thousand, two hundred twenty-one".