7201221 has 4 divisors (see below), whose sum is σ = 9601632. Its totient is φ = 4800812.

The previous prime is 7201211. The next prime is 7201237. The reversal of 7201221 is 1221027.

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 7201221 - 2⁵ = 7201189 is a prime.

7201221 is a lucky number.

It is a self number, because there is not a number n which added to its sum of digits gives 7201221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7201211) 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, 1200201 + ... + 1200206.

It is an arithmetic number, because the mean of its divisors is an integer number (2400408).

Almost surely, 2^7201221 is an apocalyptic number.

It is an amenable number.

7201221 is a deficient number, since it is larger than the sum of its proper divisors (2400411).

7201221 is a wasteful number, since it uses less digits than its factorization.

7201221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2400410.

The product of its (nonzero) digits is 56, while the sum is 15.

The square root of 7201221 is about 2683.5090832714. The cubic root of 7201221 is about 193.1087916980.

Adding to 7201221 its reverse (1221027), we get a palindrome (8422248).

The spelling of 7201221 in words is "seven million, two hundred one thousand, two hundred twenty-one".