12221121102121 has 4 divisors (see below), whose sum is σ = 12224915306244. Its totient is φ = 12217326898000.

The previous prime is 12221121102107. The next prime is 12221121102137. The reversal of 12221121102121 is 12120112112221.

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 9562541936896 + 2658579165225 = 3092336^2 + 1630515^2 .

It is a cyclic number.

It is not a de Polignac number, because 12221121102121 - 2⁵ = 12221121102089 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12221121102161) 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, 1897097230 + ... + 1897103671.

It is an arithmetic number, because the mean of its divisors is an integer number (3056228826561).

Almost surely, 2^{12221121102121} is an apocalyptic number.

It is an amenable number.

12221121102121 is a deficient number, since it is larger than the sum of its proper divisors (3794204123).

12221121102121 is an equidigital number, since it uses as much as digits as its factorization.

12221121102121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3794204122.

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

Adding to 12221121102121 its reverse (12120112112221), we get a palindrome (24341233214342).

The spelling of 12221121102121 in words is "twelve trillion, two hundred twenty-one billion, one hundred twenty-one million, one hundred two thousand, one hundred twenty-one".