85057021 has 16 divisors (see below), whose sum is σ = 98671104. Its totient is φ = 71817984.

The previous prime is 85057003. The next prime is 85057031. The reversal of 85057021 is 12075058.

It is not a de Polignac number, because 85057021 - 2⁷ = 85056893 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (85057031) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 231580 + ... + 231946.

It is an arithmetic number, because the mean of its divisors is an integer number (6166944).

Almost surely, 2^85057021 is an apocalyptic number.

It is an amenable number.

85057021 is a deficient number, since it is larger than the sum of its proper divisors (13614083).

85057021 is a wasteful number, since it uses less digits than its factorization.

85057021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 780.

The product of its (nonzero) digits is 2800, while the sum is 28.

The square root of 85057021 is about 9222.6363367532. The cubic root of 85057021 is about 439.7812635231.

The spelling of 85057021 in words is "eighty-five million, fifty-seven thousand, twenty-one".