211100000221111 has 4 divisors (see below), whose sum is σ = 211270655032552. Its totient is φ = 210929345409672.

The previous prime is 211100000221109. The next prime is 211100000221157. The reversal of 211100000221111 is 111122000001112.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 211100000221111 - 2¹ = 211100000221109 is a prime.

It is a super-4 number, since 4×211100000221111⁴ (a number of 58 digits) contains 4444 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 211100000221091 and 211100000221100.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (211100000228111) 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, 85327403865 + ... + 85327406338.

It is an arithmetic number, because the mean of its divisors is an integer number (52817663758138).

Almost surely, 2^{211100000221111} is an apocalyptic number.

211100000221111 is a deficient number, since it is larger than the sum of its proper divisors (170654811441).

211100000221111 is a wasteful number, since it uses less digits than its factorization.

211100000221111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 170654811440.

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

Adding to 211100000221111 its reverse (111122000001112), we get a palindrome (322222000222223).

The spelling of 211100000221111 in words is "two hundred eleven trillion, one hundred billion, two hundred twenty-one thousand, one hundred eleven".