8221131 has 12 divisors (see below), whose sum is σ = 11987352. Its totient is φ = 5428896.

The previous prime is 8221111. The next prime is 8221139. The reversal of 8221131 is 1311228.

It is not a de Polignac number, because 8221131 - 2¹⁴ = 8204747 is a prime.

It is a super-2 number, since 2×8221131² = 135173989838322, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (8221139) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 3306 + ... + 5231.

It is an arithmetic number, because the mean of its divisors is an integer number (998946).

Almost surely, 2^8221131 is an apocalyptic number.

8221131 is a deficient number, since it is larger than the sum of its proper divisors (3766221).

8221131 is a wasteful number, since it uses less digits than its factorization.

8221131 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8650 (or 8647 counting only the distinct ones).

The product of its digits is 96, while the sum is 18.

The square root of 8221131 is about 2867.2514713572. The cubic root of 8221131 is about 201.8260355644.

Adding to 8221131 its reverse (1311228), we get a palindrome (9532359).

Subtracting from 8221131 its reverse (1311228), we obtain a triangular number (6909903 = T₃₇₁₇).

It can be divided in two parts, 822 and 1131, that added together give a triangular number (1953 = T₆₂).

The spelling of 8221131 in words is "eight million, two hundred twenty-one thousand, one hundred thirty-one".