12221120121221 has 4 divisors (see below), whose sum is σ = 13332131041344. Its totient is φ = 11110109201100.

The previous prime is 12221120121179. The next prime is 12221120121241. The reversal of 12221120121221 is 12212102112221.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 12221120121221 - 2³⁰ = 12220046379397 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 12221120121193 and 12221120121202.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12221120121241) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 555505460045 + ... + 555505460066.

It is an arithmetic number, because the mean of its divisors is an integer number (3333032760336).

Almost surely, 2^{12221120121221} is an apocalyptic number.

12221120121221 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

12221120121221 is a deficient number, since it is larger than the sum of its proper divisors (1111010920123).

12221120121221 is a wasteful number, since it uses less digits than its factorization.

12221120121221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1111010920122.

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

Adding to 12221120121221 its reverse (12212102112221), we get a palindrome (24433222233442).

The spelling of 12221120121221 in words is "twelve trillion, two hundred twenty-one billion, one hundred twenty million, one hundred twenty-one thousand, two hundred twenty-one".