111212211011121 has 48 divisors (see below), whose sum is σ = 179981860239168. Its totient is φ = 65578929436800.

The previous prime is 111212211011071. The next prime is 111212211011197. The reversal of 111212211011121 is 121110112212111.

111212211011121 is a `hidden beast` number, since 111 + 212 + 211 + 0 + 11 + 121 = 666.

It is not a de Polignac number, because 111212211011121 - 2¹¹ = 111212211009073 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 111212211011094 and 111212211011103.

It is not an unprimeable number, because it can be changed into a prime (111212211013121) 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, 637849926 + ... + 638024256.

It is an arithmetic number, because the mean of its divisors is an integer number (3749622088316).

Almost surely, 2^{111212211011121} is an apocalyptic number.

111212211011121 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

111212211011121 is a deficient number, since it is larger than the sum of its proper divisors (68769649228047).

111212211011121 is a wasteful number, since it uses less digits than its factorization.

111212211011121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 348542 (or 348539 counting only the distinct ones).

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

Adding to 111212211011121 its reverse (121110112212111), we get a palindrome (232322323223232).

The spelling of 111212211011121 in words is "one hundred eleven trillion, two hundred twelve billion, two hundred eleven million, eleven thousand, one hundred twenty-one".