211111221222011 has 4 divisors (see below), whose sum is σ = 230303150424024. Its totient is φ = 191919292020000.

The previous prime is 211111221221987. The next prime is 211111221222047. The reversal of 211111221222011 is 110222122111112.

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 211111221222011 - 2⁴² = 206713174710907 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (211111221224011) 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, 9595964600990 + ... + 9595964601011.

It is an arithmetic number, because the mean of its divisors is an integer number (57575787606006).

Almost surely, 2^{211111221222011} is an apocalyptic number.

211111221222011 is a deficient number, since it is larger than the sum of its proper divisors (19191929202013).

211111221222011 is a wasteful number, since it uses less digits than its factorization.

211111221222011 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19191929202012.

The product of its (nonzero) digits is 64, while the sum is 20.

Adding to 211111221222011 its reverse (110222122111112), we get a palindrome (321333343333123).

The spelling of 211111221222011 in words is "two hundred eleven trillion, one hundred eleven billion, two hundred twenty-one million, two hundred twenty-two thousand, eleven".