2100200221 has 6 divisors (see below), whose sum is σ = 2443090110. Its totient is φ = 1800171576.

The previous prime is 2100200197. The next prime is 2100200231. The reversal of 2100200221 is 1220020012.

It can be written as a sum of positive squares in only one way, i.e., 2071524196 + 28676025 = 45514^2 + 5355^2 .

It is not a de Polignac number, because 2100200221 - 2¹⁷ = 2100069149 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2100200198 and 2100200207.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2100200231) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 21430566 + ... + 21430663.

It is an arithmetic number, because the mean of its divisors is an integer number (407181685).

Almost surely, 2^2100200221 is an apocalyptic number.

It is an amenable number.

2100200221 is a deficient number, since it is larger than the sum of its proper divisors (342889889).

2100200221 is an equidigital number, since it uses as much as digits as its factorization.

2100200221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42861243 (or 42861236 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 10.

The square root of 2100200221 is about 45827.9414876994. The cubic root of 2100200221 is about 1280.6198619229.

Adding to 2100200221 its reverse (1220020012), we get a palindrome (3320220233).

The spelling of 2100200221 in words is "two billion, one hundred million, two hundred thousand, two hundred twenty-one".