82986021 has 6 divisors (see below), whose sum is σ = 119868710. Its totient is φ = 55324008.

The previous prime is 82986017. The next prime is 82986041. The reversal of 82986021 is 12068928.

It can be written as a sum of positive squares in only one way, i.e., 60233121 + 22752900 = 7761^2 + 4770^2 .

It is not a de Polignac number, because 82986021 - 2² = 82986017 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (82986041) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 4610326 + ... + 4610343.

Almost surely, 2^82986021 is an apocalyptic number.

It is an amenable number.

82986021 is a deficient number, since it is larger than the sum of its proper divisors (36882689).

82986021 is a wasteful number, since it uses less digits than its factorization.

82986021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9220675 (or 9220672 counting only the distinct ones).

The product of its (nonzero) digits is 13824, while the sum is 36.

The square root of 82986021 is about 9109.6663495432. Note that the first 3 decimals coincide. The cubic root of 82986021 is about 436.1825768605.

The spelling of 82986021 in words is "eighty-two million, nine hundred eighty-six thousand, twenty-one".