12123211130221 has 4 divisors (see below), whose sum is σ = 12184750273212. Its totient is φ = 12061671987232.

The previous prime is 12123211130213. The next prime is 12123211130263. The reversal of 12123211130221 is 12203111232121.

It is a happy number.

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 11976513704100 + 146697426121 = 3460710^2 + 383011^2 .

It is a cyclic number.

It is not a de Polignac number, because 12123211130221 - 2³ = 12123211130213 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 12123211130192 and 12123211130201.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12123211130201) 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 3 ways as a sum of consecutive naturals, for example, 30769571200 + ... + 30769571593.

It is an arithmetic number, because the mean of its divisors is an integer number (3046187568303).

Almost surely, 2^{12123211130221} is an apocalyptic number.

It is an amenable number.

12123211130221 is a deficient number, since it is larger than the sum of its proper divisors (61539142991).

12123211130221 is an equidigital number, since it uses as much as digits as its factorization.

12123211130221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 61539142990.

The product of its (nonzero) digits is 288, while the sum is 22.

Adding to 12123211130221 its reverse (12203111232121), we get a palindrome (24326322362342).

The spelling of 12123211130221 in words is "twelve trillion, one hundred twenty-three billion, two hundred eleven million, one hundred thirty thousand, two hundred twenty-one".