85016021 has 4 divisors (see below), whose sum is σ = 85387500. Its totient is φ = 84644544.

The previous prime is 85016017. The next prime is 85016059. The reversal of 85016021 is 12061058.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 74218225 + 10797796 = 8615^2 + 3286^2 .

It is a cyclic number.

It is not a de Polignac number, because 85016021 - 2² = 85016017 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 (85016011) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 185396 + ... + 185853.

It is an arithmetic number, because the mean of its divisors is an integer number (21346875).

Almost surely, 2^85016021 is an apocalyptic number.

It is an amenable number.

85016021 is a deficient number, since it is larger than the sum of its proper divisors (371479).

85016021 is a wasteful number, since it uses less digits than its factorization.

85016021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 371478.

The product of its (nonzero) digits is 480, while the sum is 23.

The square root of 85016021 is about 9220.4132770717. The cubic root of 85016021 is about 439.7105896405.

Adding to 85016021 its reverse (12061058), we get a palindrome (97077079).

The spelling of 85016021 in words is "eighty-five million, sixteen thousand, twenty-one".