11122021181 has 2 divisors, whose sum is σ = 11122021182. Its totient is φ = 11122021180.

The previous prime is 11122021117. The next prime is 11122021189. The reversal of 11122021181 is 18112022111.

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., 10365276100 + 756745081 = 101810^2 + 27509^2 .

It is a cyclic number.

It is not a de Polignac number, because 11122021181 - 2⁶ = 11122021117 is a prime.

It is a super-2 number, since 2×11122021181² (a number of 21 digits) contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (11122021189) 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, 5561010590 + 5561010591.

It is an arithmetic number, because the mean of its divisors is an integer number (5561010591).

Almost surely, 2^11122021181 is an apocalyptic number.

It is an amenable number.

11122021181 is a deficient number, since it is larger than the sum of its proper divisors (1).

11122021181 is an equidigital number, since it uses as much as digits as its factorization.

11122021181 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 11122021181 its reverse (18112022111), we get a palindrome (29234043292).

The spelling of 11122021181 in words is "eleven billion, one hundred twenty-two million, twenty-one thousand, one hundred eighty-one".