211103221111111 has 4 divisors (see below), whose sum is σ = 241260824126992. Its totient is φ = 180945618095232.

The previous prime is 211103221111093. The next prime is 211103221111117. The reversal of 211103221111111 is 111111122301112.

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 211103221111111 - 2¹³ = 211103221102919 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 (211103221111117) 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, 15078801507930 + ... + 15078801507943.

It is an arithmetic number, because the mean of its divisors is an integer number (60315206031748).

Almost surely, 2^{211103221111111} is an apocalyptic number.

211103221111111 is a deficient number, since it is larger than the sum of its proper divisors (30157603015881).

211103221111111 is an equidigital number, since it uses as much as digits as its factorization.

211103221111111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30157603015880.

The product of its (nonzero) digits is 24, while the sum is 19.

Adding to 211103221111111 its reverse (111111122301112), we get a palindrome (322214343412223).

The spelling of 211103221111111 in words is "two hundred eleven trillion, one hundred three billion, two hundred twenty-one million, one hundred eleven thousand, one hundred eleven".