11010122121221 has 2 divisors, whose sum is σ = 11010122121222. Its totient is φ = 11010122121220.

The previous prime is 11010122121209. The next prime is 11010122121223. The reversal of 11010122121221 is 12212122101011.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 9237429590596 + 1772692530625 = 3039314^2 + 1331425^2 .

It is a cyclic number.

It is not a de Polignac number, because 11010122121221 - 2⁴² = 6612075610117 is a prime.

Together with 11010122121223, it forms a pair of twin primes.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 11010122121221.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (11010122121223) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5505061060610 + 5505061060611.

It is an arithmetic number, because the mean of its divisors is an integer number (5505061060611).

Almost surely, 2^{11010122121221} is an apocalyptic number.

It is an amenable number.

11010122121221 is a deficient number, since it is larger than the sum of its proper divisors (1).

11010122121221 is an equidigital number, since it uses as much as digits as its factorization.

11010122121221 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 32, while the sum is 17.

Adding to 11010122121221 its reverse (12212122101011), we get a palindrome (23222244222232).

The spelling of 11010122121221 in words is "eleven trillion, ten billion, one hundred twenty-two million, one hundred twenty-one thousand, two hundred twenty-one".