8221321111 has 4 divisors (see below), whose sum is σ = 8235770400. Its totient is φ = 8206871824.

The previous prime is 8221321061. The next prime is 8221321133. The reversal of 8221321111 is 1111231228.

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 8221321111 - 2¹¹ = 8221319063 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 (8221321211) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7223791 + ... + 7224928.

It is an arithmetic number, because the mean of its divisors is an integer number (2058942600).

Almost surely, 2^8221321111 is an apocalyptic number.

8221321111 is a deficient number, since it is larger than the sum of its proper divisors (14449289).

8221321111 is a wasteful number, since it uses less digits than its factorization.

8221321111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14449288.

The product of its digits is 192, while the sum is 22.

The square root of 8221321111 is about 90671.5010959894. The cubic root of 8221321111 is about 2018.2759127303.

Adding to 8221321111 its reverse (1111231228), we get a palindrome (9332552339).

The spelling of 8221321111 in words is "eight billion, two hundred twenty-one million, three hundred twenty-one thousand, one hundred eleven".