12222220221121 has 4 divisors (see below), whose sum is σ = 12222240268500. Its totient is φ = 12222200173744.

The previous prime is 12222220221103. The next prime is 12222220221157. The reversal of 12222220221121 is 12112202222221.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 12050173624896 + 172046596225 = 3471336^2 + 414785^2 .

It is a cyclic number.

It is not a de Polignac number, because 12222220221121 - 2⁴¹ = 10023196965569 is a prime.

It is a super-2 number, since 2×12222220221121² (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 = 12222220221092 and 12222220221101.

It is not an unprimeable number, because it can be changed into a prime (12222220221521) 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, 9079546 + ... + 10338403.

It is an arithmetic number, because the mean of its divisors is an integer number (3055560067125).

Almost surely, 2^{12222220221121} is an apocalyptic number.

It is an amenable number.

12222220221121 is a deficient number, since it is larger than the sum of its proper divisors (20047379).

12222220221121 is an equidigital number, since it uses as much as digits as its factorization.

12222220221121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20047378.

The product of its (nonzero) digits is 512, while the sum is 22.

Adding to 12222220221121 its reverse (12112202222221), we get a palindrome (24334422443342).

The spelling of 12222220221121 in words is "twelve trillion, two hundred twenty-two billion, two hundred twenty million, two hundred twenty-one thousand, one hundred twenty-one".