121320123111 has 16 divisors (see below), whose sum is σ = 196072926720. Its totient is φ = 73527347160.

The previous prime is 121320123079. The next prime is 121320123137. The reversal of 121320123111 is 111321023121.

121320123111 is a `hidden beast` number, since 1 + 21 + 320 + 12 + 311 + 1 = 666.

It is not a de Polignac number, because 121320123111 - 2⁵ = 121320123079 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121320123151) 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, 204242335 + ... + 204242928.

It is an arithmetic number, because the mean of its divisors is an integer number (12254557920).

Almost surely, 2^121320123111 is an apocalyptic number.

121320123111 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

121320123111 is a deficient number, since it is larger than the sum of its proper divisors (74752803609).

121320123111 is a wasteful number, since it uses less digits than its factorization.

121320123111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 408485283 (or 408485277 counting only the distinct ones).

The product of its (nonzero) digits is 72, while the sum is 18.

Adding to 121320123111 its reverse (111321023121), we get a palindrome (232641146232).

The spelling of 121320123111 in words is "one hundred twenty-one billion, three hundred twenty million, one hundred twenty-three thousand, one hundred eleven".