12221220112121 has 16 divisors (see below), whose sum is σ = 13042550384640. Its totient is φ = 11411279066880.

The previous prime is 12221220112103. The next prime is 12221220112169. The reversal of 12221220112121 is 12121102212221.

It is a cyclic number.

It is not a de Polignac number, because 12221220112121 - 2¹⁴ = 12221220095737 is a prime.

It is a super-2 number, since 2×12221220112121² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 12221220112093 and 12221220112102.

It is not an unprimeable number, because it can be changed into a prime (12221220112921) 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, 58320110 + ... + 58529288.

It is an arithmetic number, because the mean of its divisors is an integer number (815159399040).

Almost surely, 2^{12221220112121} is an apocalyptic number.

It is an amenable number.

12221220112121 is a deficient number, since it is larger than the sum of its proper divisors (821330272519).

12221220112121 is a wasteful number, since it uses less digits than its factorization.

12221220112121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 236384.

The product of its (nonzero) digits is 128, while the sum is 20.

Adding to 12221220112121 its reverse (12121102212221), we get a palindrome (24342322324342).

The spelling of 12221220112121 in words is "twelve trillion, two hundred twenty-one billion, two hundred twenty million, one hundred twelve thousand, one hundred twenty-one".