111212211101211 has 48 divisors (see below), whose sum is σ = 179495827056000. Its totient is φ = 65782260933120.

The previous prime is 111212211101107. The next prime is 111212211101213. The reversal of 111212211101211 is 112101112212111.

111212211101211 is a `hidden beast` number, since 1 + 1 + 121 + 221 + 110 + 1 + 211 = 666.

It is not a de Polignac number, because 111212211101211 - 2¹⁴ = 111212211084827 is a prime.

It is not an unprimeable number, because it can be changed into a prime (111212211101213) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 67677046 + ... + 69300843.

It is an arithmetic number, because the mean of its divisors is an integer number (3739496397000).

Almost surely, 2^{111212211101211} is an apocalyptic number.

111212211101211 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

111212211101211 is a deficient number, since it is larger than the sum of its proper divisors (68283615954789).

111212211101211 is a wasteful number, since it uses less digits than its factorization.

111212211101211 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 136978104 (or 136978101 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 18.

Adding to 111212211101211 its reverse (112101112212111), we get a palindrome (223313323313322).

The spelling of 111212211101211 in words is "one hundred eleven trillion, two hundred twelve billion, two hundred eleven million, one hundred one thousand, two hundred eleven".