12123020013221 has 16 divisors (see below), whose sum is σ = 13343676393600. Its totient is φ = 10946192923200.

The previous prime is 12123020013199. The next prime is 12123020013257. The reversal of 12123020013221 is 12231002032121.

It is a cyclic number.

It is not a de Polignac number, because 12123020013221 - 2²⁶ = 12122952904357 is a prime.

It is a super-2 number, since 2×12123020013221² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 12123020013193 and 12123020013202.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12123020013421) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 55511921 + ... + 55729878.

It is an arithmetic number, because the mean of its divisors is an integer number (833979774600).

Almost surely, 2^{12123020013221} is an apocalyptic number.

It is an amenable number.

12123020013221 is a deficient number, since it is larger than the sum of its proper divisors (1220656380379).

12123020013221 is a wasteful number, since it uses less digits than its factorization.

12123020013221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 111241996.

The product of its (nonzero) digits is 288, while the sum is 20.

Adding to 12123020013221 its reverse (12231002032121), we get a palindrome (24354022045342).

The spelling of 12123020013221 in words is "twelve trillion, one hundred twenty-three billion, twenty million, thirteen thousand, two hundred twenty-one".