12102221220121 has 4 divisors (see below), whose sum is σ = 12103615975972. Its totient is φ = 12100826464272.

The previous prime is 12102221220119. The next prime is 12102221220139. The reversal of 12102221220121 is 12102212220121.

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 6659682164496 + 5442539055625 = 2580636^2 + 2332925^2 .

It is a cyclic number.

It is not a de Polignac number, because 12102221220121 - 2¹ = 12102221220119 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12102221221121) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 697364910 + ... + 697382263.

It is an arithmetic number, because the mean of its divisors is an integer number (3025903993993).

Almost surely, 2^{12102221220121} is an apocalyptic number.

It is an amenable number.

12102221220121 is a deficient number, since it is larger than the sum of its proper divisors (1394755851).

12102221220121 is an equidigital number, since it uses as much as digits as its factorization.

12102221220121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1394755850.

The product of its (nonzero) digits is 128, while the sum is 19.

Adding to 12102221220121 its reverse (12102212220121), we get a palindrome (24204433440242).

Subtracting from 12102221220121 its reverse (12102212220121), we obtain a square (9000000 = 3000²).

The spelling of 12102221220121 in words is "twelve trillion, one hundred two billion, two hundred twenty-one million, two hundred twenty thousand, one hundred twenty-one".