85244221 has 2 divisors, whose sum is σ = 85244222. Its totient is φ = 85244220.

The previous prime is 85244219. The next prime is 85244261. The reversal of 85244221 is 12244258.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 64176121 + 21068100 = 8011^2 + 4590^2 .

It is a cyclic number.

It is not a de Polignac number, because 85244221 - 2¹ = 85244219 is a prime.

Together with 85244219, it forms a pair of twin primes.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 85244221.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (85244261) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 42622110 + 42622111.

It is an arithmetic number, because the mean of its divisors is an integer number (42622111).

Almost surely, 2^85244221 is an apocalyptic number.

It is an amenable number.

85244221 is a deficient number, since it is larger than the sum of its proper divisors (1).

85244221 is an equidigital number, since it uses as much as digits as its factorization.

85244221 is an evil number, because the sum of its binary digits is even.

The product of its digits is 5120, while the sum is 28.

The square root of 85244221 is about 9232.7797006102. The cubic root of 85244221 is about 440.1036618706.

Adding to 85244221 its reverse (12244258), we get a palindrome (97488479).

The spelling of 85244221 in words is "eighty-five million, two hundred forty-four thousand, two hundred twenty-one".