211100112221 has 4 divisors (see below), whose sum is σ = 213190212444. Its totient is φ = 209010012000.

The previous prime is 211100112217. The next prime is 211100112229. The reversal of 211100112221 is 122211001112.

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 159940005625 + 51160106596 = 399925^2 + 226186^2 .

It is a cyclic number.

It is not a de Polignac number, because 211100112221 - 2² = 211100112217 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 211100112196 and 211100112205.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (211100112229) 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 3 ways as a sum of consecutive naturals, for example, 1045049960 + ... + 1045050161.

It is an arithmetic number, because the mean of its divisors is an integer number (53297553111).

Almost surely, 2^211100112221 is an apocalyptic number.

It is an amenable number.

211100112221 is a deficient number, since it is larger than the sum of its proper divisors (2090100223).

211100112221 is a wasteful number, since it uses less digits than its factorization.

211100112221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2090100222.

The product of its (nonzero) digits is 16, while the sum is 14.

Adding to 211100112221 its reverse (122211001112), we get a palindrome (333311113333).

The spelling of 211100112221 in words is "two hundred eleven billion, one hundred million, one hundred twelve thousand, two hundred twenty-one".