211011211111211 has 16 divisors (see below), whose sum is σ = 245544404176128. Its totient is φ = 177585734599200.

The previous prime is 211011211111121. The next prime is 211011211111237. The reversal of 211011211111211 is 112111112110112.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 211011211111211 - 2²² = 211011206916907 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 211011211111211.

It is not an unprimeable number, because it can be changed into a prime (211011211111111) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 438633005 + ... + 439113806.

It is an arithmetic number, because the mean of its divisors is an integer number (15346525261008).

Almost surely, 2^{211011211111211} is an apocalyptic number.

211011211111211 is a deficient number, since it is larger than the sum of its proper divisors (34533193064917).

211011211111211 is an equidigital number, since it uses as much as digits as its factorization.

211011211111211 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 877747442.

The product of its (nonzero) digits is 8, while the sum is 17.

Adding to 211011211111211 its reverse (112111112110112), we get a palindrome (323122323221323).

The spelling of 211011211111211 in words is "two hundred eleven trillion, eleven billion, two hundred eleven million, one hundred eleven thousand, two hundred eleven".