111211111100121 has 32 divisors (see below), whose sum is σ = 157519607731200. Its totient is φ = 69550457819136.

The previous prime is 111211111100119. The next prime is 111211111100227. The reversal of 111211111100121 is 121001111112111.

It is a happy number.

It is not a de Polignac number, because 111211111100121 - 2¹ = 111211111100119 is a prime.

It is a super-2 number, since 2×111211111100121² (a number of 29 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 111211111100121.

It is not an unprimeable number, because it can be changed into a prime (111211111100321) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 53409655 + ... + 55452803.

It is an arithmetic number, because the mean of its divisors is an integer number (4922487741600).

Almost surely, 2^{111211111100121} is an apocalyptic number.

It is an amenable number.

111211111100121 is a deficient number, since it is larger than the sum of its proper divisors (46308496631079).

111211111100121 is a wasteful number, since it uses less digits than its factorization.

111211111100121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2046673.

The product of its (nonzero) digits is 4, while the sum is 15.

Adding to 111211111100121 its reverse (121001111112111), we get a palindrome (232212222212232).

The spelling of 111211111100121 in words is "one hundred eleven trillion, two hundred eleven billion, one hundred eleven million, one hundred thousand, one hundred twenty-one".