111122012202221 has 2 divisors, whose sum is σ = 111122012202222. Its totient is φ = 111122012202220.

The previous prime is 111122012202169. The next prime is 111122012202269. The reversal of 111122012202221 is 122202210221111.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 110411128828900 + 710883373321 = 10507670^2 + 843139^2 .

It is a cyclic number.

It is not a de Polignac number, because 111122012202221 - 2³⁴ = 111104832333037 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 111122012202193 and 111122012202202.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (111122012207221) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 55561006101110 + 55561006101111.

It is an arithmetic number, because the mean of its divisors is an integer number (55561006101111).

Almost surely, 2^{111122012202221} is an apocalyptic number.

It is an amenable number.

111122012202221 is a deficient number, since it is larger than the sum of its proper divisors (1).

111122012202221 is an equidigital number, since it uses as much as digits as its factorization.

111122012202221 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 111122012202221 its reverse (122202210221111), we get a palindrome (233324222423332).

The spelling of 111122012202221 in words is "one hundred eleven trillion, one hundred twenty-two billion, twelve million, two hundred two thousand, two hundred twenty-one".