11112220112221 has 2 divisors, whose sum is σ = 11112220112222. Its totient is φ = 11112220112220.

The previous prime is 11112220112197. The next prime is 11112220112233. The reversal of 11112220112221 is 12221102221111.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 7597663780996 + 3514556331225 = 2756386^2 + 1874715^2 .

It is a cyclic number.

It is not a de Polignac number, because 11112220112221 - 2⁹ = 11112220111709 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (11112220112621) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5556110056110 + 5556110056111.

It is an arithmetic number, because the mean of its divisors is an integer number (5556110056111).

Almost surely, 2^{11112220112221} is an apocalyptic number.

It is an amenable number.

11112220112221 is a deficient number, since it is larger than the sum of its proper divisors (1).

11112220112221 is an equidigital number, since it uses as much as digits as its factorization.

11112220112221 is an odious number, because the sum of its binary digits is odd.

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

Adding to 11112220112221 its reverse (12221102221111), we get a palindrome (23333322333332).

The spelling of 11112220112221 in words is "eleven trillion, one hundred twelve billion, two hundred twenty million, one hundred twelve thousand, two hundred twenty-one".