12021123111123 has 32 divisors (see below), whose sum is σ = 18395688039424. Its totient is φ = 6840105149952.

The previous prime is 12021123111077. The next prime is 12021123111131. The reversal of 12021123111123 is 32111132112021.

It is not a de Polignac number, because 12021123111123 - 2⁶ = 12021123111059 is a prime.

It is a super-2 number, since 2×12021123111123² (a number of 27 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 12021123111123.

It is not an unprimeable number, because it can be changed into a prime (12021123161123) 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, 3387711 + ... + 5959767.

It is an arithmetic number, because the mean of its divisors is an integer number (574865251232).

Almost surely, 2^{12021123111123} is an apocalyptic number.

12021123111123 is a deficient number, since it is larger than the sum of its proper divisors (6374564928301).

12021123111123 is a wasteful number, since it uses less digits than its factorization.

12021123111123 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2573011.

The product of its (nonzero) digits is 144, while the sum is 21.

Adding to 12021123111123 its reverse (32111132112021), we get a palindrome (44132255223144).

The spelling of 12021123111123 in words is "twelve trillion, twenty-one billion, one hundred twenty-three million, one hundred eleven thousand, one hundred twenty-three".