85855021 has 8 divisors (see below), whose sum is σ = 102386304. Its totient is φ = 70390320.

The previous prime is 85855019. The next prime is 85855037. The reversal of 85855021 is 12055858.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 85855021 - 2¹ = 85855019 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (85855001) 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 in 7 ways as a sum of consecutive naturals, for example, 266470 + ... + 266791.

It is an arithmetic number, because the mean of its divisors is an integer number (12798288).

Almost surely, 2^85855021 is an apocalyptic number.

It is an amenable number.

85855021 is a deficient number, since it is larger than the sum of its proper divisors (16531283).

85855021 is a wasteful number, since it uses less digits than its factorization.

85855021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 533291.

The product of its (nonzero) digits is 16000, while the sum is 34.

The square root of 85855021 is about 9265.7984545316. The cubic root of 85855021 is about 441.1523187382.

The spelling of 85855021 in words is "eighty-five million, eight hundred fifty-five thousand, twenty-one".