7170221 has 4 divisors (see below), whose sum is σ = 7417500. Its totient is φ = 6922944.

The previous prime is 7170199. The next prime is 7170253. The reversal of 7170221 is 1220717.

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

It can be written as a sum of positive squares in 2 ways, for example, as 1240996 + 5929225 = 1114^2 + 2435^2 .

It is a cyclic number.

It is not a de Polignac number, because 7170221 - 2¹⁴ = 7153837 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 7170193 and 7170202.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7170271) 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, 123596 + ... + 123653.

It is an arithmetic number, because the mean of its divisors is an integer number (1854375).

Almost surely, 2^7170221 is an apocalyptic number.

It is an amenable number.

7170221 is a deficient number, since it is larger than the sum of its proper divisors (247279).

7170221 is a wasteful number, since it uses less digits than its factorization.

7170221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 247278.

The product of its (nonzero) digits is 196, while the sum is 20.

The square root of 7170221 is about 2677.7268344624. The cubic root of 7170221 is about 192.8312932367.

Adding to 7170221 its reverse (1220717), we get a palindrome (8390938).

The spelling of 7170221 in words is "seven million, one hundred seventy thousand, two hundred twenty-one".