111211212123 has 24 divisors (see below), whose sum is σ = 175861183680. Its totient is φ = 67162552560.

The previous prime is 111211212103. The next prime is 111211212191. The reversal of 111211212123 is 321212112111.

It is a happy number.

It is not a de Polignac number, because 111211212123 - 2²¹ = 111209114971 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 111211212096 and 111211212105.

It is not an unprimeable number, because it can be changed into a prime (111211212103) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1956693 + ... + 2012726.

It is an arithmetic number, because the mean of its divisors is an integer number (7327549320).

Almost surely, 2^111211212123 is an apocalyptic number.

111211212123 is a deficient number, since it is larger than the sum of its proper divisors (64649971557).

111211212123 is a wasteful number, since it uses less digits than its factorization.

111211212123 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3969719 (or 3969716 counting only the distinct ones).

The product of its digits is 48, while the sum is 18.

Adding to 111211212123 its reverse (321212112111), we get a palindrome (432423324234).

The spelling of 111211212123 in words is "one hundred eleven billion, two hundred eleven million, two hundred twelve thousand, one hundred twenty-three".