7213211 has 4 divisors (see below), whose sum is σ = 7287672. Its totient is φ = 7138752.

The previous prime is 7213201. The next prime is 7213223. The reversal of 7213211 is 1123127.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-7213211 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 7213211.

It is not an unprimeable number, because it can be changed into a prime (7213201) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 37085 + ... + 37278.

It is an arithmetic number, because the mean of its divisors is an integer number (1821918).

Almost surely, 2^7213211 is an apocalyptic number.

7213211 is a deficient number, since it is larger than the sum of its proper divisors (74461).

7213211 is an equidigital number, since it uses as much as digits as its factorization.

7213211 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 74460.

The product of its digits is 84, while the sum is 17.

The square root of 7213211 is about 2685.7421693081. The cubic root of 7213211 is about 193.2159073557.

Subtracting from 7213211 its product of digits (84), we obtain a palindrome (7213127).

Adding to 7213211 its reverse (1123127), we get a palindrome (8336338).

The spelling of 7213211 in words is "seven million, two hundred thirteen thousand, two hundred eleven".