85208121 has 12 divisors (see below), whose sum is σ = 124916272. Its totient is φ = 55957176.

The previous prime is 85208083. The next prime is 85208129. The reversal of 85208121 is 12180258.

It is not a de Polignac number, because 85208121 - 2¹⁰ = 85207097 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (85208129) 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 in 11 ways as a sum of consecutive naturals, for example, 70051 + ... + 71256.

Almost surely, 2^85208121 is an apocalyptic number.

It is an amenable number.

85208121 is a deficient number, since it is larger than the sum of its proper divisors (39708151).

85208121 is a wasteful number, since it uses less digits than its factorization.

85208121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 141380 (or 141377 counting only the distinct ones).

The product of its (nonzero) digits is 1280, while the sum is 27.

The square root of 85208121 is about 9230.8245027191. The cubic root of 85208121 is about 440.0415267280.

Adding to 85208121 its reverse (12180258), we get a palindrome (97388379).

It can be divided in two parts, 8520 and 8121, that added together give a square (16641 = 129²).

The spelling of 85208121 in words is "eighty-five million, two hundred eight thousand, one hundred twenty-one".