12111222023221 has 2 divisors, whose sum is σ = 12111222023222. Its totient is φ = 12111222023220.

The previous prime is 12111222023161. The next prime is 12111222023227. The reversal of 12111222023221 is 12232022211121.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 6253805579121 + 5857416444100 = 2500761^2 + 2420210^2 .

It is a cyclic number.

It is not a de Polignac number, because 12111222023221 - 2¹⁷ = 12111221892149 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 12111222023192 and 12111222023201.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12111222023227) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6055611011610 + 6055611011611.

It is an arithmetic number, because the mean of its divisors is an integer number (6055611011611).

Almost surely, 2^{12111222023221} is an apocalyptic number.

It is an amenable number.

12111222023221 is a deficient number, since it is larger than the sum of its proper divisors (1).

12111222023221 is an equidigital number, since it uses as much as digits as its factorization.

12111222023221 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 384, while the sum is 22.

Adding to 12111222023221 its reverse (12232022211121), we get a palindrome (24343244234342).

The spelling of 12111222023221 in words is "twelve trillion, one hundred eleven billion, two hundred twenty-two million, twenty-three thousand, two hundred twenty-one".