111221200123 has 4 divisors (see below), whose sum is σ = 121332218328. Its totient is φ = 101110181920.

The previous prime is 111221200093. The next prime is 111221200169. The reversal of 111221200123 is 321002122111.

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

It is a de Polignac number, because none of the positive numbers 2^k-111221200123 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 111221200097 and 111221200106.

It is not an unprimeable number, because it can be changed into a prime (111221200523) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5055509086 + ... + 5055509107.

It is an arithmetic number, because the mean of its divisors is an integer number (30333054582).

Almost surely, 2^111221200123 is an apocalyptic number.

111221200123 is a deficient number, since it is larger than the sum of its proper divisors (10111018205).

111221200123 is a wasteful number, since it uses less digits than its factorization.

111221200123 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10111018204.

The product of its (nonzero) digits is 48, while the sum is 16.

Adding to 111221200123 its reverse (321002122111), we get a palindrome (432223322234).

The spelling of 111221200123 in words is "one hundred eleven billion, two hundred twenty-one million, two hundred thousand, one hundred twenty-three".