82843021 has 16 divisors (see below), whose sum is σ = 90086400. Its totient is φ = 75932208.

The previous prime is 82843009. The next prime is 82843039. The reversal of 82843021 is 12034828.

It is not a de Polignac number, because 82843021 - 2¹¹ = 82840973 is a prime.

It is a super-2 number, since 2×82843021² = 13725932256812882, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (82843051) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 74556 + ... + 75658.

It is an arithmetic number, because the mean of its divisors is an integer number (5630400).

Almost surely, 2^82843021 is an apocalyptic number.

It is an amenable number.

82843021 is a deficient number, since it is larger than the sum of its proper divisors (7243379).

82843021 is a wasteful number, since it uses less digits than its factorization.

82843021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1248.

The product of its (nonzero) digits is 3072, while the sum is 28.

The square root of 82843021 is about 9101.8141598255. The cubic root of 82843021 is about 435.9318921894.

Adding to 82843021 its reverse (12034828), we get a palindrome (94877849).

The spelling of 82843021 in words is "eighty-two million, eight hundred forty-three thousand, twenty-one".