2211220112221 has 2 divisors, whose sum is σ = 2211220112222. Its totient is φ = 2211220112220.

The previous prime is 2211220112191. The next prime is 2211220112273. The reversal of 2211220112221 is 1222110221122.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1605719808900 + 605500303321 = 1267170^2 + 778139^2 .

It is a cyclic number.

It is not a de Polignac number, because 2211220112221 - 2¹⁹ = 2211219587933 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2211220112291) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1105610056110 + 1105610056111.

It is an arithmetic number, because the mean of its divisors is an integer number (1105610056111).

Almost surely, 2^{2211220112221} is an apocalyptic number.

It is an amenable number.

2211220112221 is a deficient number, since it is larger than the sum of its proper divisors (1).

2211220112221 is an equidigital number, since it uses as much as digits as its factorization.

2211220112221 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 128, while the sum is 19.

Adding to 2211220112221 its reverse (1222110221122), we get a palindrome (3433330333343).

The spelling of 2211220112221 in words is "two trillion, two hundred eleven billion, two hundred twenty million, one hundred twelve thousand, two hundred twenty-one".