7118221 has 4 divisors (see below), whose sum is σ = 7765344. Its totient is φ = 6471100.

The previous prime is 7118219. The next prime is 7118231. The reversal of 7118221 is 1228117.

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 7118221 - 2¹ = 7118219 is a prime.

It is a Smith number, since the sum of its digits (22) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 7118192 and 7118201.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7118231) 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, 323545 + ... + 323566.

It is an arithmetic number, because the mean of its divisors is an integer number (1941336).

Almost surely, 2^7118221 is an apocalyptic number.

It is an amenable number.

7118221 is a deficient number, since it is larger than the sum of its proper divisors (647123).

7118221 is a wasteful number, since it uses less digits than its factorization.

7118221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 647122.

The product of its digits is 224, while the sum is 22.

The square root of 7118221 is about 2667.9994377811. Note that the first 3 decimals coincide. The cubic root of 7118221 is about 192.3640103239.

The spelling of 7118221 in words is "seven million, one hundred eighteen thousand, two hundred twenty-one".