82253221 has 4 divisors (see below), whose sum is σ = 85829472. Its totient is φ = 78676972.

The previous prime is 82253219. The next prime is 82253231. The reversal of 82253221 is 12235228.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 82253221 - 2¹ = 82253219 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 (82253231) 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, 1788091 + ... + 1788136.

It is an arithmetic number, because the mean of its divisors is an integer number (21457368).

Almost surely, 2^82253221 is an apocalyptic number.

It is an amenable number.

82253221 is a deficient number, since it is larger than the sum of its proper divisors (3576251).

82253221 is a wasteful number, since it uses less digits than its factorization.

82253221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3576250.

The product of its digits is 1920, while the sum is 25.

The square root of 82253221 is about 9069.3561513483. The cubic root of 82253221 is about 434.8948898284.

Adding to 82253221 its reverse (12235228), we get a palindrome (94488449).

The spelling of 82253221 in words is "eighty-two million, two hundred fifty-three thousand, two hundred twenty-one".