85422221 has 2 divisors, whose sum is σ = 85422222. Its totient is φ = 85422220.

The previous prime is 85422217. The next prime is 85422247. The reversal of 85422221 is 12222458.

It is an a-pointer prime, because the next prime (85422247) can be obtained adding 85422221 to its sum of digits (26).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 50965321 + 34456900 = 7139^2 + 5870^2 .

It is a cyclic number.

It is not a de Polignac number, because 85422221 - 2² = 85422217 is a prime.

It is a Chen prime.

It is a nialpdrome in base 10.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (85422121) 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, 42711110 + 42711111.

It is an arithmetic number, because the mean of its divisors is an integer number (42711111).

Almost surely, 2^85422221 is an apocalyptic number.

It is an amenable number.

85422221 is a deficient number, since it is larger than the sum of its proper divisors (1).

85422221 is an equidigital number, since it uses as much as digits as its factorization.

85422221 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2560, while the sum is 26.

The square root of 85422221 is about 9242.4142408788. The cubic root of 85422221 is about 440.4097783730.

Adding to 85422221 its reverse (12222458), we get a palindrome (97644679).

The spelling of 85422221 in words is "eighty-five million, four hundred twenty-two thousand, two hundred twenty-one".