111211222010121 has 32 divisors (see below), whose sum is σ = 175145923228800. Its totient is φ = 69543234158400.

The previous prime is 111211222010113. The next prime is 111211222010131. The reversal of 111211222010121 is 121010222112111.

It is a happy number.

111211222010121 is a `hidden beast` number, since 111 + 211 + 2 + 220 + 1 + 0 + 121 = 666.

It is not a de Polignac number, because 111211222010121 - 2³ = 111211222010113 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 111211222010094 and 111211222010103.

It is not an unprimeable number, because it can be changed into a prime (111211222010131) 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 31 ways as a sum of consecutive naturals, for example, 1073146246 + ... + 1073249871.

It is an arithmetic number, because the mean of its divisors is an integer number (5473310100900).

Almost surely, 2^{111211222010121} is an apocalyptic number.

It is an amenable number.

111211222010121 is a deficient number, since it is larger than the sum of its proper divisors (63934701218679).

111211222010121 is a wasteful number, since it uses less digits than its factorization.

111211222010121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2146396246 (or 2146396240 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 18.

Adding to 111211222010121 its reverse (121010222112111), we get a palindrome (232221444122232).

The spelling of 111211222010121 in words is "one hundred eleven trillion, two hundred eleven billion, two hundred twenty-two million, ten thousand, one hundred twenty-one".