8221571 has 4 divisors (see below), whose sum is σ = 8248152. Its totient is φ = 8194992.

The previous prime is 8221567. The next prime is 8221573. The reversal of 8221571 is 1751228.

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

It is a cyclic number.

It is not a de Polignac number, because 8221571 - 2² = 8221567 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 8221571.

It is not an unprimeable number, because it can be changed into a prime (8221573) 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, 12821 + ... + 13446.

It is an arithmetic number, because the mean of its divisors is an integer number (2062038).

Almost surely, 2^8221571 is an apocalyptic number.

8221571 is a deficient number, since it is larger than the sum of its proper divisors (26581).

8221571 is a wasteful number, since it uses less digits than its factorization.

8221571 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26580.

The product of its digits is 1120, while the sum is 26.

The square root of 8221571 is about 2867.3281988639. The cubic root of 8221571 is about 201.8296361181.

Adding to 8221571 its reverse (1751228), we get a palindrome (9972799).

The spelling of 8221571 in words is "eight million, two hundred twenty-one thousand, five hundred seventy-one".