211111221220111 has 8 divisors (see below), whose sum is σ = 211373144656560. Its totient is φ = 210849300180672.

The previous prime is 211111221220063. The next prime is 211111221220121. The reversal of 211111221220111 is 111022122111112.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-211111221220111 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 (211111221220121) 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, 231187716 + ... + 232099078.

It is an arithmetic number, because the mean of its divisors is an integer number (26421643082070).

Almost surely, 2^{211111221220111} is an apocalyptic number.

211111221220111 is a deficient number, since it is larger than the sum of its proper divisors (261923436449).

211111221220111 is an equidigital number, since it uses as much as digits as its factorization.

211111221220111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1198505.

The product of its (nonzero) digits is 32, while the sum is 19.

Adding to 211111221220111 its reverse (111022122111112), we get a palindrome (322133343331223).

The spelling of 211111221220111 in words is "two hundred eleven trillion, one hundred eleven billion, two hundred twenty-one million, two hundred twenty thousand, one hundred eleven".