82141821 has 6 divisors (see below), whose sum is σ = 118649310. Its totient is φ = 54761208.

The previous prime is 82141811. The next prime is 82141837. The reversal of 82141821 is 12814128.

It can be written as a sum of positive squares in only one way, i.e., 75012921 + 7128900 = 8661^2 + 2670^2 .

It is not a de Polignac number, because 82141821 - 2⁶ = 82141757 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (82141811) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 4563426 + ... + 4563443.

It is an arithmetic number, because the mean of its divisors is an integer number (19774885).

Almost surely, 2^82141821 is an apocalyptic number.

It is an amenable number.

82141821 is a deficient number, since it is larger than the sum of its proper divisors (36507489).

82141821 is a wasteful number, since it uses less digits than its factorization.

82141821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9126875 (or 9126872 counting only the distinct ones).

The product of its digits is 1024, while the sum is 27.

The square root of 82141821 is about 9063.2125099216. The cubic root of 82141821 is about 434.6984672113.

Adding to 82141821 its reverse (12814128), we get a palindrome (94955949).

The spelling of 82141821 in words is "eighty-two million, one hundred forty-one thousand, eight hundred twenty-one".