211212111111 has 8 divisors (see below), whose sum is σ = 281973986304. Its totient is φ = 140629155000.

The previous prime is 211212111083. The next prime is 211212111113. The reversal of 211212111111 is 111111212112.

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

It is not a de Polignac number, because 211212111111 - 2⁵ = 211212111079 is a prime.

It is a super-2 number, since 2×211212111111² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (211212111113) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 44727015 + ... + 44731736.

It is an arithmetic number, because the mean of its divisors is an integer number (35246748288).

Almost surely, 2^211212111111 is an apocalyptic number.

211212111111 is a deficient number, since it is larger than the sum of its proper divisors (70761875193).

211212111111 is an equidigital number, since it uses as much as digits as its factorization.

211212111111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 89459541.

The product of its digits is 8, while the sum is 15.

Adding to 211212111111 its reverse (111111212112), we get a palindrome (322323323223).

The spelling of 211212111111 in words is "two hundred eleven billion, two hundred twelve million, one hundred eleven thousand, one hundred eleven".