121002112111 has 4 divisors (see below), whose sum is σ = 121033326232. Its totient is φ = 120970897992.

The previous prime is 121002112097. The next prime is 121002112129. The reversal of 121002112111 is 111211200121.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 121002112111 - 2⁹ = 121002111599 is a prime.

It is a super-2 number, since 2×121002112111² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 121002112091 and 121002112100.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121002112211) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 15601245 + ... + 15608998.

It is an arithmetic number, because the mean of its divisors is an integer number (30258331558).

Almost surely, 2^121002112111 is an apocalyptic number.

121002112111 is a deficient number, since it is larger than the sum of its proper divisors (31214121).

121002112111 is an equidigital number, since it uses as much as digits as its factorization.

121002112111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31214120.

The product of its (nonzero) digits is 8, while the sum is 13.

Adding to 121002112111 its reverse (111211200121), we get a palindrome (232213312232).

The spelling of 121002112111 in words is "one hundred twenty-one billion, two million, one hundred twelve thousand, one hundred eleven".