11021221100081 has 2 divisors, whose sum is σ = 11021221100082. Its totient is φ = 11021221100080.

The previous prime is 11021221100077. The next prime is 11021221100137. The reversal of 11021221100081 is 18000112212011.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 10557242154481 + 463978945600 = 3249191^2 + 681160^2 .

It is a cyclic number.

It is not a de Polignac number, because 11021221100081 - 2² = 11021221100077 is a prime.

It is a super-2 number, since 2×11021221100081² (a number of 27 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (11021221130081) 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, 5510610550040 + 5510610550041.

It is an arithmetic number, because the mean of its divisors is an integer number (5510610550041).

Almost surely, 2^{11021221100081} is an apocalyptic number.

It is an amenable number.

11021221100081 is a deficient number, since it is larger than the sum of its proper divisors (1).

11021221100081 is an equidigital number, since it uses as much as digits as its factorization.

11021221100081 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 64, while the sum is 20.

Adding to 11021221100081 its reverse (18000112212011), we get a palindrome (29021333312092).

The spelling of 11021221100081 in words is "eleven trillion, twenty-one billion, two hundred twenty-one million, one hundred thousand, eighty-one".