121200000111 has 16 divisors (see below), whose sum is σ = 180699228000. Its totient is φ = 80285347584.

The previous prime is 121200000109. The next prime is 121200000139. The reversal of 121200000111 is 111000002121.

It is a happy number.

It is not a de Polignac number, because 121200000111 - 2¹ = 121200000109 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (9).

It is a junction number, because it is equal to n+sod(n) for n = 121200000093 and 121200000102.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121200000161) 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 15 ways as a sum of consecutive naturals, for example, 14291586 + ... + 14300063.

It is an arithmetic number, because the mean of its divisors is an integer number (11293701750).

Almost surely, 2^121200000111 is an apocalyptic number.

121200000111 is a deficient number, since it is larger than the sum of its proper divisors (59499227889).

121200000111 is a wasteful number, since it uses less digits than its factorization.

121200000111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28591815 (or 28591809 counting only the distinct ones).

The product of its (nonzero) digits is 4, while the sum is 9.

Adding to 121200000111 its reverse (111000002121), we get a palindrome (232200002232).

The spelling of 121200000111 in words is "one hundred twenty-one billion, two hundred million, one hundred eleven", and thus it is an aban number.