111121202121111 has 48 divisors (see below), whose sum is σ = 202887960684864. Its totient is φ = 57029235881472.

The previous prime is 111121202121077. The next prime is 111121202121113.

111121202121111 is a `hidden beast` number, since 111 + 121 + 202 + 121 + 111 = 666.

111121202121111 is nontrivially palindromic in base 10.

It is not a de Polignac number, because 111121202121111 - 2¹⁰ = 111121202120087 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (111121202121113) 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 47 ways as a sum of consecutive naturals, for example, 1833471366 + ... + 1833531971.

It is an arithmetic number, because the mean of its divisors is an integer number (4226832514268).

Almost surely, 2^{111121202121111} is an apocalyptic number.

111121202121111 is a deficient number, since it is larger than the sum of its proper divisors (91766758563753).

111121202121111 is a wasteful number, since it uses less digits than its factorization.

111121202121111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3667003400 (or 3667003397 counting only the distinct ones).

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

It can be divided in two parts, 11112120 and 2121111, that added together give a palindrome (13233231).

The spelling of 111121202121111 in words is "one hundred eleven trillion, one hundred twenty-one billion, two hundred two million, one hundred twenty-one thousand, one hundred eleven".