11021111081 has 2 divisors, whose sum is σ = 11021111082. Its totient is φ = 11021111080.

The previous prime is 11021111039. The next prime is 11021111083. The reversal of 11021111081 is 18011112011.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 7119984400 + 3901126681 = 84380^2 + 62459^2 .

It is an emirp because it is prime and its reverse (18011112011) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 11021111081 - 2¹⁴ = 11021094697 is a prime.

It is a super-3 number, since 3×11021111081³ (a number of 31 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

Together with 11021111083, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (11021111083) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5510555540 + 5510555541.

It is an arithmetic number, because the mean of its divisors is an integer number (5510555541).

Almost surely, 2^11021111081 is an apocalyptic number.

It is an amenable number.

11021111081 is a deficient number, since it is larger than the sum of its proper divisors (1).

11021111081 is an equidigital number, since it uses as much as digits as its factorization.

11021111081 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 16, while the sum is 17.

Adding to 11021111081 its reverse (18011112011), we get a palindrome (29032223092).

The spelling of 11021111081 in words is "eleven billion, twenty-one million, one hundred eleven thousand, eighty-one".