85885021 has 4 divisors (see below), whose sum is σ = 85922172. Its totient is φ = 85847872.

The previous prime is 85885001. The next prime is 85885091. The reversal of 85885021 is 12058858.

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 21724921 + 64160100 = 4661^2 + 8010^2 .

It is a cyclic number.

It is not a de Polignac number, because 85885021 - 2¹³ = 85876829 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 (85885001) 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, 14860 + ... + 19813.

It is an arithmetic number, because the mean of its divisors is an integer number (21480543).

Almost surely, 2^85885021 is an apocalyptic number.

85885021 is the 4954-th nonagonal number.

It is an amenable number.

85885021 is a deficient number, since it is larger than the sum of its proper divisors (37151).

85885021 is a wasteful number, since it uses less digits than its factorization.

85885021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 37150.

The product of its (nonzero) digits is 25600, while the sum is 37.

The square root of 85885021 is about 9267.4171698483. The cubic root of 85885021 is about 441.2036961579.

The spelling of 85885021 in words is "eighty-five million, eight hundred eighty-five thousand, twenty-one".