211100221111 has 8 divisors (see below), whose sum is σ = 227347009344. Its totient is φ = 194854620000.

The previous prime is 211100221093. The next prime is 211100221181. The reversal of 211100221111 is 111122001112.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 211100221111 - 2¹¹ = 211100219063 is a prime.

It is a super-4 number, since 4×211100221111⁴ (a number of 46 digits) contains 4444 as substring. Note that it is a super-d number also for d = 2.

It is a Harshad number since it is a multiple of its sum of digits (13).

It is a junction number, because it is equal to n+sod(n) for n = 211100221091 and 211100221100.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (211100221181) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 91365 + ... + 656161.

It is an arithmetic number, because the mean of its divisors is an integer number (28418376168).

Almost surely, 2^211100221111 is an apocalyptic number.

211100221111 is a deficient number, since it is larger than the sum of its proper divisors (16246788233).

211100221111 is a wasteful number, since it uses less digits than its factorization.

211100221111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 593561.

The product of its (nonzero) digits is 8, while the sum is 13.

Adding to 211100221111 its reverse (111122001112), we get a palindrome (322222222223).

The spelling of 211100221111 in words is "two hundred eleven billion, one hundred million, two hundred twenty-one thousand, one hundred eleven".