121111221110111 has 16 divisors (see below), whose sum is σ = 133034955456000. Its totient is φ = 109742928612768.

The previous prime is 121111221110101. The next prime is 121111221110123. The reversal of 121111221110111 is 111011122111121.

It is a happy number.

It is not a de Polignac number, because 121111221110111 - 2¹⁴ = 121111221093727 is a prime.

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 121111221110111.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121111221110101) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1927790 + ... + 15682436.

It is an arithmetic number, because the mean of its divisors is an integer number (8314684716000).

Almost surely, 2^{121111221110111} is an apocalyptic number.

121111221110111 is a deficient number, since it is larger than the sum of its proper divisors (11923734345889).

121111221110111 is a wasteful number, since it uses less digits than its factorization.

121111221110111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13774838.

The product of its (nonzero) digits is 8, while the sum is 17.

Adding to 121111221110111 its reverse (111011122111121), we get a palindrome (232122343221232).

The spelling of 121111221110111 in words is "one hundred twenty-one trillion, one hundred eleven billion, two hundred twenty-one million, one hundred ten thousand, one hundred eleven".