2002002221 has 4 divisors (see below), whose sum is σ = 2002280412. Its totient is φ = 2001724032.

The previous prime is 2002002199. The next prime is 2002002251. The reversal of 2002002221 is 1222002002.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 129709321 + 1872292900 = 11389^2 + 43270^2 .

It is a cyclic number.

It is not a de Polignac number, because 2002002221 - 2⁶ = 2002002157 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2002002251) 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, 128006 + ... + 142791.

It is an arithmetic number, because the mean of its divisors is an integer number (500570103).

Almost surely, 2^2002002221 is an apocalyptic number.

It is an amenable number.

2002002221 is a deficient number, since it is larger than the sum of its proper divisors (278191).

2002002221 is an equidigital number, since it uses as much as digits as its factorization.

2002002221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 278190.

The product of its (nonzero) digits is 32, while the sum is 11.

The square root of 2002002221 is about 44743.7394615157. The cubic root of 2002002221 is about 1260.3413497346.

Adding to 2002002221 its reverse (1222002002), we get a palindrome (3224004223).

The spelling of 2002002221 in words is "two billion, two million, two thousand, two hundred twenty-one".