12120010121221 has 4 divisors (see below), whose sum is σ = 12120715241100. Its totient is φ = 12119305001344.

The previous prime is 12120010121209. The next prime is 12120010121249. The reversal of 12120010121221 is 12212101002121.

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 9613187064196 + 2506823057025 = 3100514^2 + 1583295^2 .

It is a cyclic number.

It is not a de Polignac number, because 12120010121221 - 2³³ = 12111420186629 is a prime.

It is a super-2 number, since 2×12120010121221² (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 = 12120010121195 and 12120010121204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12120010121521) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 352534156 + ... + 352568533.

It is an arithmetic number, because the mean of its divisors is an integer number (3030178810275).

Almost surely, 2^{12120010121221} is an apocalyptic number.

It is an amenable number.

12120010121221 is a deficient number, since it is larger than the sum of its proper divisors (705119879).

12120010121221 is an equidigital number, since it uses as much as digits as its factorization.

12120010121221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 705119878.

The product of its (nonzero) digits is 32, while the sum is 16.

Adding to 12120010121221 its reverse (12212101002121), we get a palindrome (24332111123342).

The spelling of 12120010121221 in words is "twelve trillion, one hundred twenty billion, ten million, one hundred twenty-one thousand, two hundred twenty-one".