12021223311121 has 4 divisors (see below), whose sum is σ = 12022320449332. Its totient is φ = 12020126172912.

The previous prime is 12021223311107. The next prime is 12021223311137. The reversal of 12021223311121 is 12111332212021.

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 3333107462400 + 8688115848721 = 1825680^2 + 2947561^2 .

It is a cyclic number.

It is not a de Polignac number, because 12021223311121 - 2¹⁵ = 12021223278353 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 12021223311092 and 12021223311101.

It is not an unprimeable number, because it can be changed into a prime (12021223311101) 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, 548552670 + ... + 548574583.

It is an arithmetic number, because the mean of its divisors is an integer number (3005580112333).

Almost surely, 2^{12021223311121} is an apocalyptic number.

It is an amenable number.

12021223311121 is a deficient number, since it is larger than the sum of its proper divisors (1097138211).

12021223311121 is a wasteful number, since it uses less digits than its factorization.

12021223311121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1097138210.

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

Adding to 12021223311121 its reverse (12111332212021), we get a palindrome (24132555523142).

The spelling of 12021223311121 in words is "twelve trillion, twenty-one billion, two hundred twenty-three million, three hundred eleven thousand, one hundred twenty-one".