985087021 has 4 divisors (see below), whose sum is σ = 985232700. Its totient is φ = 984941344.

The previous prime is 985087013. The next prime is 985087027. The reversal of 985087021 is 120780589.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 120780589 = 1289 ⋅93701.

It can be written as a sum of positive squares in 2 ways, for example, as 383611396 + 601475625 = 19586^2 + 24525^2 .

It is a cyclic number.

It is not a de Polignac number, because 985087021 - 2³ = 985087013 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 (985087027) 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, 62176 + ... + 76393.

It is an arithmetic number, because the mean of its divisors is an integer number (246308175).

Almost surely, 2^985087021 is an apocalyptic number.

It is an amenable number.

985087021 is a deficient number, since it is larger than the sum of its proper divisors (145679).

985087021 is a wasteful number, since it uses less digits than its factorization.

985087021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 145678.

The product of its (nonzero) digits is 40320, while the sum is 40.

The square root of 985087021 is about 31386.0959821383. The cubic root of 985087021 is about 995.0040894422.

The spelling of 985087021 in words is "nine hundred eighty-five million, eighty-seven thousand, twenty-one".