22142161 has 2 divisors, whose sum is σ = 22142162. Its totient is φ = 22142160.

The previous prime is 22142149. The next prime is 22142171. The reversal of 22142161 is 16124122.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 21911761 + 230400 = 4681^2 + 480^2 .

It is a cyclic number.

It is not a de Polignac number, because 22142161 - 2⁹ = 22141649 is a prime.

It is not a weakly prime, because it can be changed into another prime (22142101) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11071080 + 11071081.

It is an arithmetic number, because the mean of its divisors is an integer number (11071081).

Almost surely, 2^22142161 is an apocalyptic number.

It is an amenable number.

22142161 is a deficient number, since it is larger than the sum of its proper divisors (1).

22142161 is an equidigital number, since it uses as much as digits as its factorization.

22142161 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 192, while the sum is 19.

The square root of 22142161 is about 4705.5457706838. The cubic root of 22142161 is about 280.8061842360.

Adding to 22142161 its reverse (16124122), we get a palindrome (38266283).

The spelling of 22142161 in words is "twenty-two million, one hundred forty-two thousand, one hundred sixty-one".