22112110221221 has 2 divisors, whose sum is σ = 22112110221222. Its totient is φ = 22112110221220.

The previous prime is 22112110221217. The next prime is 22112110221241. The reversal of 22112110221221 is 12212201121122.

It is an a-pointer prime, because the next prime (22112110221241) can be obtained adding 22112110221221 to its sum of digits (20).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 16677103905121 + 5435006316100 = 4083761^2 + 2331310^2 .

It is a cyclic number.

It is not a de Polignac number, because 22112110221221 - 2² = 22112110221217 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 22112110221193 and 22112110221202.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (22112110221241) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11056055110610 + 11056055110611.

It is an arithmetic number, because the mean of its divisors is an integer number (11056055110611).

Almost surely, 2^{22112110221221} is an apocalyptic number.

It is an amenable number.

22112110221221 is a deficient number, since it is larger than the sum of its proper divisors (1).

22112110221221 is an equidigital number, since it uses as much as digits as its factorization.

22112110221221 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 128, while the sum is 20.

Adding to 22112110221221 its reverse (12212201121122), we get a palindrome (34324311342343).

The spelling of 22112110221221 in words is "twenty-two trillion, one hundred twelve billion, one hundred ten million, two hundred twenty-one thousand, two hundred twenty-one".