111212122211 has 8 divisors (see below), whose sum is σ = 111426491904. Its totient is φ = 110997933120.

The previous prime is 111212122199. The next prime is 111212122247. The reversal of 111212122211 is 112221212111.

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

It is a cyclic number.

It is not a de Polignac number, because 111212122211 - 2¹⁰ = 111212121187 is a prime.

It is a super-2 number, since 2×111212122211² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 111212122211.

It is not an unprimeable number, because it can be changed into a prime (111212122811) 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, 1221605 + ... + 1309481.

It is an arithmetic number, because the mean of its divisors is an integer number (13928311488).

Almost surely, 2^111212122211 is an apocalyptic number.

111212122211 is a deficient number, since it is larger than the sum of its proper divisors (214369693).

111212122211 is an equidigital number, since it uses as much as digits as its factorization.

111212122211 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 90301.

The product of its digits is 32, while the sum is 17.

Adding to 111212122211 its reverse (112221212111), we get a palindrome (223433334322).

The spelling of 111212122211 in words is "one hundred eleven billion, two hundred twelve million, one hundred twenty-two thousand, two hundred eleven".