82353221 has 4 divisors (see below), whose sum is σ = 82398444. Its totient is φ = 82308000.

The previous prime is 82353199. The next prime is 82353223. The reversal of 82353221 is 12235328.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 38925121 + 43428100 = 6239^2 + 6590^2 .

It is a cyclic number.

It is not a de Polignac number, because 82353221 - 2²⁶ = 15244357 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 (82353223) 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, 19760 + ... + 23561.

It is an arithmetic number, because the mean of its divisors is an integer number (20599611).

Almost surely, 2^82353221 is an apocalyptic number.

It is an amenable number.

82353221 is a deficient number, since it is larger than the sum of its proper divisors (45223).

82353221 is a wasteful number, since it uses less digits than its factorization.

82353221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 45222.

The product of its digits is 2880, while the sum is 26.

The square root of 82353221 is about 9074.8675472428. The cubic root of 82353221 is about 435.0710607476.

Adding to 82353221 its reverse (12235328), we get a palindrome (94588549).

The spelling of 82353221 in words is "eighty-two million, three hundred fifty-three thousand, two hundred twenty-one".