11220221081 has 2 divisors, whose sum is σ = 11220221082. Its totient is φ = 11220221080.

The previous prime is 11220221059. The next prime is 11220221113. The reversal of 11220221081 is 18012202211.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 10937813056 + 282408025 = 104584^2 + 16805^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-11220221081 is a prime.

It is a super-2 number, since 2×11220221081² (a number of 21 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (11220221281) 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, 5610110540 + 5610110541.

It is an arithmetic number, because the mean of its divisors is an integer number (5610110541).

Almost surely, 2^11220221081 is an apocalyptic number.

It is an amenable number.

11220221081 is a deficient number, since it is larger than the sum of its proper divisors (1).

11220221081 is an equidigital number, since it uses as much as digits as its factorization.

11220221081 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 11220221081 its reverse (18012202211), we get a palindrome (29232423292).

The spelling of 11220221081 in words is "eleven billion, two hundred twenty million, two hundred twenty-one thousand, eighty-one".