12121130221 has 4 divisors (see below), whose sum is σ = 12121476444. Its totient is φ = 12120784000.

The previous prime is 12121130213. The next prime is 12121130227. The reversal of 12121130221 is 12203112121.

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 221592996 + 11899537225 = 14886^2 + 109085^2 .

It is a cyclic number.

It is not a de Polignac number, because 12121130221 - 2³ = 12121130213 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 12121130195 and 12121130204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12121130227) 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, 113830 + ... + 192871.

It is an arithmetic number, because the mean of its divisors is an integer number (3030369111).

Almost surely, 2^12121130221 is an apocalyptic number.

It is an amenable number.

12121130221 is a deficient number, since it is larger than the sum of its proper divisors (346223).

12121130221 is an equidigital number, since it uses as much as digits as its factorization.

12121130221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 346222.

The product of its (nonzero) digits is 48, while the sum is 16.

Adding to 12121130221 its reverse (12203112121), we get a palindrome (24324242342).

The spelling of 12121130221 in words is "twelve billion, one hundred twenty-one million, one hundred thirty thousand, two hundred twenty-one".