2002106221 has 4 divisors (see below), whose sum is σ = 2007474172. Its totient is φ = 1996738272.

The previous prime is 2002106213. The next prime is 2002106299. The reversal of 2002106221 is 1226012002.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1226012002 = 2 ⋅613006001.

It can be written as a sum of positive squares in 2 ways, for example, as 1702470121 + 299636100 = 41261^2 + 17310^2 .

It is a cyclic number.

It is not a de Polignac number, because 2002106221 - 2³ = 2002106213 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2002106195 and 2002106204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2002106521) 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, 2683416 + ... + 2684161.

It is an arithmetic number, because the mean of its divisors is an integer number (501868543).

Almost surely, 2^2002106221 is an apocalyptic number.

It is an amenable number.

2002106221 is a deficient number, since it is larger than the sum of its proper divisors (5367951).

2002106221 is an equidigital number, since it uses as much as digits as its factorization.

2002106221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5367950.

The product of its (nonzero) digits is 96, while the sum is 16.

The square root of 2002106221 is about 44744.9016201846. The cubic root of 2002106221 is about 1260.3631734251.

Adding to 2002106221 its reverse (1226012002), we get a palindrome (3228118223).

The spelling of 2002106221 in words is "two billion, two million, one hundred six thousand, two hundred twenty-one".