111231210123 has 32 divisors (see below), whose sum is σ = 189229075200. Its totient is φ = 63864806400.

The previous prime is 111231210119. The next prime is 111231210193. The reversal of 111231210123 is 321012132111.

It is not a de Polignac number, because 111231210123 - 2² = 111231210119 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 111231210096 and 111231210105.

It is not an unprimeable number, because it can be changed into a prime (111231210193) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 9850038 + ... + 9861323.

It is an arithmetic number, because the mean of its divisors is an integer number (5913408600).

Almost surely, 2^111231210123 is an apocalyptic number.

111231210123 is a deficient number, since it is larger than the sum of its proper divisors (77997865077).

111231210123 is a wasteful number, since it uses less digits than its factorization.

111231210123 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19711400 (or 19711394 counting only the distinct ones).

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

Adding to 111231210123 its reverse (321012132111), we get a palindrome (432243342234).

The spelling of 111231210123 in words is "one hundred eleven billion, two hundred thirty-one million, two hundred ten thousand, one hundred twenty-three".