121121011212111 has 6 divisors (see below), whose sum is σ = 174952571750840. Its totient is φ = 80747340808068.

The previous prime is 121121011212041. The next prime is 121121011212137. The reversal of 121121011212111 is 111212110121121.

121121011212111 is a `hidden beast` number, since 1 + 211 + 210 + 11 + 21 + 211 + 1 = 666.

It is not a de Polignac number, because 121121011212111 - 2⁴³ = 112324918189903 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121121011212211) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 6728945067331 + ... + 6728945067348.

Almost surely, 2^{121121011212111} is an apocalyptic number.

121121011212111 is a deficient number, since it is larger than the sum of its proper divisors (53831560538729).

121121011212111 is a wasteful number, since it uses less digits than its factorization.

121121011212111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13457890134685 (or 13457890134682 counting only the distinct ones).

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

Adding to 121121011212111 its reverse (111212110121121), we get a palindrome (232333121333232).

The spelling of 121121011212111 in words is "one hundred twenty-one trillion, one hundred twenty-one billion, eleven million, two hundred twelve thousand, one hundred eleven".