7210221 has 4 divisors (see below), whose sum is σ = 9613632. Its totient is φ = 4806812.

The previous prime is 7210207. The next prime is 7210237. The reversal of 7210221 is 1220127.

7210221 is digitally balanced in base 3 and base 4, because in such bases it contains all the possibile digits an equal number of times.

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 7210221 - 2¹⁸ = 6948077 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 7210221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7210421) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1201701 + ... + 1201706.

It is an arithmetic number, because the mean of its divisors is an integer number (2403408).

Almost surely, 2^7210221 is an apocalyptic number.

It is an amenable number.

7210221 is a deficient number, since it is larger than the sum of its proper divisors (2403411).

7210221 is a wasteful number, since it uses less digits than its factorization.

7210221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2403410.

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

The square root of 7210221 is about 2685.1854684546. The cubic root of 7210221 is about 193.1892065607.

Adding to 7210221 its reverse (1220127), we get a palindrome (8430348).

The spelling of 7210221 in words is "seven million, two hundred ten thousand, two hundred twenty-one".