11220111012221 has 2 divisors, whose sum is σ = 11220111012222. Its totient is φ = 11220111012220.

The previous prime is 11220111012217. The next prime is 11220111012223. The reversal of 11220111012221 is 12221011102211.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 8885675383225 + 2334435628996 = 2980885^2 + 1527886^2 .

It is a cyclic number.

It is not a de Polignac number, because 11220111012221 - 2² = 11220111012217 is a prime.

It is a super-2 number, since 2×11220111012221² (a number of 27 digits) contains 22 as substring.

Together with 11220111012223, 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 11220111012221.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (11220111012223) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5610055506110 + 5610055506111.

It is an arithmetic number, because the mean of its divisors is an integer number (5610055506111).

Almost surely, 2^{11220111012221} is an apocalyptic number.

It is an amenable number.

11220111012221 is a deficient number, since it is larger than the sum of its proper divisors (1).

11220111012221 is an equidigital number, since it uses as much as digits as its factorization.

11220111012221 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 11220111012221 its reverse (12221011102211), we get a palindrome (23441122114432).

The spelling of 11220111012221 in words is "eleven trillion, two hundred twenty billion, one hundred eleven million, twelve thousand, two hundred twenty-one".