8130221 has 4 divisors (see below), whose sum is σ = 8869344. Its totient is φ = 7391100.

The previous prime is 8130193. The next prime is 8130251. The reversal of 8130221 is 1220318.

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 8130221 - 2¹⁴ = 8113837 is a prime.

It is a super-2 number, since 2×8130221² = 132200987017682, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 8130221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8130251) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 369545 + ... + 369566.

It is an arithmetic number, because the mean of its divisors is an integer number (2217336).

Almost surely, 2^8130221 is an apocalyptic number.

It is an amenable number.

8130221 is a deficient number, since it is larger than the sum of its proper divisors (739123).

8130221 is a wasteful number, since it uses less digits than its factorization.

8130221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 739122.

The product of its (nonzero) digits is 96, while the sum is 17.

The square root of 8130221 is about 2851.3542396553. The cubic root of 8130221 is about 201.0793396512.

Adding to 8130221 its reverse (1220318), we get a palindrome (9350539).

Subtracting from 8130221 its reverse (1220318), we obtain a triangular number (6909903 = T₃₇₁₇).

The spelling of 8130221 in words is "eight million, one hundred thirty thousand, two hundred twenty-one".