12221222122121 has 8 divisors (see below), whose sum is σ = 12233542603464. Its totient is φ = 12208907571840.

The previous prime is 12221222122091. The next prime is 12221222122127. The reversal of 12221222122121 is 12122122212221.

It can be written as a sum of positive squares in 4 ways, for example, as 7909612096 + 12213312510025 = 88936^2 + 3494755^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 12221222122121 - 2¹⁴ = 12221222105737 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12221222122127) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2646191 + ... + 5607563.

It is an arithmetic number, because the mean of its divisors is an integer number (1529192825433).

Almost surely, 2^{12221222122121} is an apocalyptic number.

It is an amenable number.

12221222122121 is a deficient number, since it is larger than the sum of its proper divisors (12320481343).

12221222122121 is a wasteful number, since it uses less digits than its factorization.

12221222122121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2965531.

The product of its digits is 512, while the sum is 23.

Adding to 12221222122121 its reverse (12122122212221), we get a palindrome (24343344334342).

The spelling of 12221222122121 in words is "twelve trillion, two hundred twenty-one billion, two hundred twenty-two million, one hundred twenty-two thousand, one hundred twenty-one".