85189821 has 16 divisors (see below), whose sum is σ = 115678080. Its totient is φ = 55756800.

The previous prime is 85189817. The next prime is 85189889. The reversal of 85189821 is 12898158.

It is not a de Polignac number, because 85189821 - 2² = 85189817 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (85189721) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 39261 + ... + 41373.

It is an arithmetic number, because the mean of its divisors is an integer number (7229880).

Almost surely, 2^85189821 is an apocalyptic number.

It is an amenable number.

85189821 is a deficient number, since it is larger than the sum of its proper divisors (30488259).

85189821 is a wasteful number, since it uses less digits than its factorization.

85189821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2356.

The product of its digits is 46080, while the sum is 42.

The square root of 85189821 is about 9229.8332054268. The cubic root of 85189821 is about 440.0100221546.

The spelling of 85189821 in words is "eighty-five million, one hundred eighty-nine thousand, eight hundred twenty-one".