2001202221 has 4 divisors (see below), whose sum is σ = 2668269632. Its totient is φ = 1334134812.

The previous prime is 2001202211. The next prime is 2001202261. The reversal of 2001202221 is 1222021002.

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 not a de Polignac number, because 2001202221 - 2¹³ = 2001194029 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2001202197 and 2001202206.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2001202211) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 333533701 + ... + 333533706.

It is an arithmetic number, because the mean of its divisors is an integer number (667067408).

Almost surely, 2^2001202221 is an apocalyptic number.

It is an amenable number.

2001202221 is a deficient number, since it is larger than the sum of its proper divisors (667067411).

2001202221 is an equidigital number, since it uses as much as digits as its factorization.

2001202221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 667067410.

The product of its (nonzero) digits is 32, while the sum is 12.

The square root of 2001202221 is about 44734.7987700850. The cubic root of 2001202221 is about 1260.1734499189.

Adding to 2001202221 its reverse (1222021002), we get a palindrome (3223223223).

The spelling of 2001202221 in words is "two billion, one million, two hundred two thousand, two hundred twenty-one".