12121211123 has 32 divisors (see below), whose sum is σ = 15033600000. Its totient is φ = 9569127552.

The previous prime is 12121211111. The next prime is 12121211131. The reversal of 12121211123 is 32111212121.

It is a happy number.

12121211123 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 12121211123 - 2¹⁴ = 12121194739 is a prime.

It is a super-2 number, since 2×12121211123² (a number of 21 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (17).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12121211143) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1612628 + ... + 1620126.

It is an arithmetic number, because the mean of its divisors is an integer number (469800000).

Almost surely, 2^12121211123 is an apocalyptic number.

12121211123 is a deficient number, since it is larger than the sum of its proper divisors (2912388877).

12121211123 is an frugal number, since it uses more digits than its factorization.

12121211123 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7604 (or 7570 counting only the distinct ones).

The product of its digits is 48, while the sum is 17.

Adding to 12121211123 its reverse (32111212121), we get a palindrome (44232423244).

The spelling of 12121211123 in words is "twelve billion, one hundred twenty-one million, two hundred eleven thousand, one hundred twenty-three".