121002011111 has 4 divisors (see below), whose sum is σ = 124905301824. Its totient is φ = 117098720400.

The previous prime is 121002011099. The next prime is 121002011149. The reversal of 121002011111 is 111110200121.

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 121002011111 - 2⁶ = 121002011047 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 121002011092 and 121002011101.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121002010111) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1951645310 + ... + 1951645371.

It is an arithmetic number, because the mean of its divisors is an integer number (31226325456).

Almost surely, 2^121002011111 is an apocalyptic number.

121002011111 is a deficient number, since it is larger than the sum of its proper divisors (3903290713).

121002011111 is an equidigital number, since it uses as much as digits as its factorization.

121002011111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3903290712.

The product of its (nonzero) digits is 4, while the sum is 11.

Adding to 121002011111 its reverse (111110200121), we get a palindrome (232112211232).

The spelling of 121002011111 in words is "one hundred twenty-one billion, two million, eleven thousand, one hundred eleven".