22191167081 has 2 divisors, whose sum is σ = 22191167082. Its totient is φ = 22191167080.

The previous prime is 22191167029. The next prime is 22191167087. The reversal of 22191167081 is 18076119122.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 21450238681 + 740928400 = 146459^2 + 27220^2 .

It is a cyclic number.

It is not a de Polignac number, because 22191167081 - 2³⁰ = 21117425257 is a prime.

It is a super-2 number, since 2×22191167081² (a number of 21 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (22191167087) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11095583540 + 11095583541.

It is an arithmetic number, because the mean of its divisors is an integer number (11095583541).

Almost surely, 2^22191167081 is an apocalyptic number.

It is an amenable number.

22191167081 is a deficient number, since it is larger than the sum of its proper divisors (1).

22191167081 is an equidigital number, since it uses as much as digits as its factorization.

22191167081 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 12096, while the sum is 38.

The spelling of 22191167081 in words is "twenty-two billion, one hundred ninety-one million, one hundred sixty-seven thousand, eighty-one".