12121110011221 has 8 divisors (see below), whose sum is σ = 12136364443800. Its totient is φ = 12105856250880.

The previous prime is 12121110011209. The next prime is 12121110011237. The reversal of 12121110011221 is 12211001112121.

12121110011221 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 3261666321 + 12117848344900 = 57111^2 + 3481070^2 .

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 12121110011221 - 2¹⁹ = 12121109486933 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 12121110011195 and 12121110011204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12121110011251) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 42807891 + ... + 43090111.

It is an arithmetic number, because the mean of its divisors is an integer number (1517045555475).

Almost surely, 2^{12121110011221} is an apocalyptic number.

It is an amenable number.

12121110011221 is a deficient number, since it is larger than the sum of its proper divisors (15254432579).

12121110011221 is an equidigital number, since it uses as much as digits as its factorization.

12121110011221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 336119.

The product of its (nonzero) digits is 16, while the sum is 16.

Adding to 12121110011221 its reverse (12211001112121), we get a palindrome (24332111123342).

The spelling of 12121110011221 in words is "twelve trillion, one hundred twenty-one billion, one hundred ten million, eleven thousand, two hundred twenty-one".