2100212222221 has 4 divisors (see below), whose sum is σ = 2134641930844. Its totient is φ = 2065782513600.

The previous prime is 2100212222137. The next prime is 2100212222243. The reversal of 2100212222221 is 1222222120012.

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 769811457321 + 1330400764900 = 877389^2 + 1153430^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2100212222221 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 (2100212222321) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 17214854220 + ... + 17214854341.

It is an arithmetic number, because the mean of its divisors is an integer number (533660482711).

Almost surely, 2^{2100212222221} is an apocalyptic number.

It is an amenable number.

2100212222221 is a deficient number, since it is larger than the sum of its proper divisors (34429708623).

2100212222221 is an equidigital number, since it uses as much as digits as its factorization.

2100212222221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 34429708622.

The product of its (nonzero) digits is 256, while the sum is 19.

Adding to 2100212222221 its reverse (1222222120012), we get a palindrome (3322434342233).

The spelling of 2100212222221 in words is "two trillion, one hundred billion, two hundred twelve million, two hundred twenty-two thousand, two hundred twenty-one".