22081811 has 2 divisors, whose sum is σ = 22081812. Its totient is φ = 22081810.

The previous prime is 22081777. The next prime is 22081831. The reversal of 22081811 is 11818022.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-22081811 is a prime.

It is not a weakly prime, because it can be changed into another prime (22081831) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11040905 + 11040906.

It is an arithmetic number, because the mean of its divisors is an integer number (11040906).

Almost surely, 2^22081811 is an apocalyptic number.

22081811 is a deficient number, since it is larger than the sum of its proper divisors (1).

22081811 is an equidigital number, since it uses as much as digits as its factorization.

22081811 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 256, while the sum is 23.

The square root of 22081811 is about 4699.1287490342. The cubic root of 22081811 is about 280.5508331736.

Adding to 22081811 its reverse (11818022), we get a palindrome (33899833).

The spelling of 22081811 in words is "twenty-two million, eighty-one thousand, eight hundred eleven".