2100212221 has 4 divisors (see below), whose sum is σ = 2100427200. Its totient is φ = 2099997244.

The previous prime is 2100212209. The next prime is 2100212227. The reversal of 2100212221 is 1222120012.

It is a happy number.

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 2100212221 - 2⁹ = 2100211709 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 (2100212227) 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, 92101 + ... + 112618.

It is an arithmetic number, because the mean of its divisors is an integer number (525106800).

Almost surely, 2^2100212221 is an apocalyptic number.

It is an amenable number.

2100212221 is a deficient number, since it is larger than the sum of its proper divisors (214979).

2100212221 is a wasteful number, since it uses less digits than its factorization.

2100212221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 214978.

The product of its (nonzero) digits is 32, while the sum is 13.

The square root of 2100212221 is about 45828.0724120053. The cubic root of 2100212221 is about 1280.6223009616.

Adding to 2100212221 its reverse (1222120012), we get a palindrome (3322332233).

The spelling of 2100212221 in words is "two billion, one hundred million, two hundred twelve thousand, two hundred twenty-one".