12210211221121 has 4 divisors (see below), whose sum is σ = 12210547562032. Its totient is φ = 12209874880212.

The previous prime is 12210211221097. The next prime is 12210211221151. The reversal of 12210211221121 is 12112211201221.

It is a happy number.

12210211221121 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 12210211221121 - 2²⁵ = 12210177666689 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12210211221151) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 168115995 + ... + 168188608.

It is an arithmetic number, because the mean of its divisors is an integer number (3052636890508).

Almost surely, 2^{12210211221121} is an apocalyptic number.

It is an amenable number.

12210211221121 is a deficient number, since it is larger than the sum of its proper divisors (336340911).

12210211221121 is an equidigital number, since it uses as much as digits as its factorization.

12210211221121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 336340910.

The product of its (nonzero) digits is 64, while the sum is 19.

Adding to 12210211221121 its reverse (12112211201221), we get a palindrome (24322422422342).

The spelling of 12210211221121 in words is "twelve trillion, two hundred ten billion, two hundred eleven million, two hundred twenty-one thousand, one hundred twenty-one".