211211001111111 has 16 divisors (see below), whose sum is σ = 286231948554240. Its totient is φ = 138498704298720.

The previous prime is 211211001111073. The next prime is 211211001111157. The reversal of 211211001111111 is 111111100112112.

It is a happy number.

It is not a de Polignac number, because 211211001111111 - 2¹⁷ = 211211000980039 is a prime.

It is a super-2 number, since 2×211211001111111² (a number of 29 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (211211001111211) 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, 102437010 + ... + 104478528.

It is an arithmetic number, because the mean of its divisors is an integer number (17889496784640).

Almost surely, 2^{211211001111111} is an apocalyptic number.

211211001111111 is a deficient number, since it is larger than the sum of its proper divisors (75020947443129).

211211001111111 is a wasteful number, since it uses less digits than its factorization.

211211001111111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2606926.

The product of its (nonzero) digits is 4, while the sum is 15.

Adding to 211211001111111 its reverse (111111100112112), we get a palindrome (322322101223223).

The spelling of 211211001111111 in words is "two hundred eleven trillion, two hundred eleven billion, one million, one hundred eleven thousand, one hundred eleven".