11012221211221 has 2 divisors, whose sum is σ = 11012221211222. Its totient is φ = 11012221211220.

The previous prime is 11012221211191. The next prime is 11012221211249. The reversal of 11012221211221 is 12211212221011.

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., 10979355147121 + 32866064100 = 3313511^2 + 181290^2 .

It is a cyclic number.

It is not a de Polignac number, because 11012221211221 - 2⁷ = 11012221211093 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (11012221211521) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5506110605610 + 5506110605611.

It is an arithmetic number, because the mean of its divisors is an integer number (5506110605611).

Almost surely, 2^{11012221211221} is an apocalyptic number.

It is an amenable number.

11012221211221 is a deficient number, since it is larger than the sum of its proper divisors (1).

11012221211221 is an equidigital number, since it uses as much as digits as its factorization.

11012221211221 is an evil number, because the sum of its binary digits is even.

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

Adding to 11012221211221 its reverse (12211212221011), we get a palindrome (23223433432232).

The spelling of 11012221211221 in words is "eleven trillion, twelve billion, two hundred twenty-one million, two hundred eleven thousand, two hundred twenty-one".