211101221111 has 12 divisors (see below), whose sum is σ = 237696321072. Its totient is φ = 187229460000.

The previous prime is 211101221083. The next prime is 211101221117. The reversal of 211101221111 is 111122101112.

It is not a de Polignac number, because 211101221111 - 2³⁴ = 193921351927 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 (211101221117) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 21271115 + ... + 21281036.

It is an arithmetic number, because the mean of its divisors is an integer number (19808026756).

Almost surely, 2^211101221111 is an apocalyptic number.

211101221111 is a deficient number, since it is larger than the sum of its proper divisors (26595099961).

211101221111 is a wasteful number, since it uses less digits than its factorization.

211101221111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42552214 (or 42552203 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 14.

Adding to 211101221111 its reverse (111122101112), we get a palindrome (322223322223).

The spelling of 211101221111 in words is "two hundred eleven billion, one hundred one million, two hundred twenty-one thousand, one hundred eleven".