7164221 has 4 divisors (see below), whose sum is σ = 7173600. Its totient is φ = 7154844.

The previous prime is 7164203. The next prime is 7164239. The reversal of 7164221 is 1224617.

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, and also an emirpimes, since its reverse is a distinct semiprime: 1224617 = 277 ⋅4421.

It is an interprime number because it is at equal distance from previous prime (7164203) and next prime (7164239).

It is a cyclic number.

It is not a de Polignac number, because 7164221 - 2¹⁰ = 7163197 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 (7164251) 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, 3431 + ... + 5108.

It is an arithmetic number, because the mean of its divisors is an integer number (1793400).

Almost surely, 2^7164221 is an apocalyptic number.

It is an amenable number.

7164221 is a deficient number, since it is larger than the sum of its proper divisors (9379).

7164221 is an equidigital number, since it uses as much as digits as its factorization.

7164221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9378.

The product of its digits is 672, while the sum is 23.

The square root of 7164221 is about 2676.6062467236. The cubic root of 7164221 is about 192.7774915185. Note that the first 3 decimals are identical.

Adding to 7164221 its reverse (1224617), we get a palindrome (8388838).

The spelling of 7164221 in words is "seven million, one hundred sixty-four thousand, two hundred twenty-one".