7001221 has 2 divisors, whose sum is σ = 7001222. Its totient is φ = 7001220.

The previous prime is 7001213. The next prime is 7001233. The reversal of 7001221 is 1221007.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 5013121 + 1988100 = 2239^2 + 1410^2 .

It is a cyclic number.

It is not a de Polignac number, because 7001221 - 2³ = 7001213 is a prime.

7001221 is a modest number, since divided by 1221 gives 7 as remainder.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (7001021) 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 as a sum of consecutive naturals, namely, 3500610 + 3500611.

It is an arithmetic number, because the mean of its divisors is an integer number (3500611).

Almost surely, 2^7001221 is an apocalyptic number.

It is an amenable number.

7001221 is a deficient number, since it is larger than the sum of its proper divisors (1).

7001221 is an equidigital number, since it uses as much as digits as its factorization.

7001221 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 28, while the sum is 13.

The square root of 7001221 is about 2645.9820483140. The cubic root of 7001221 is about 191.3042399591.

Adding to 7001221 its reverse (1221007), we get a palindrome (8222228).

The spelling of 7001221 in words is "seven million, one thousand, two hundred twenty-one".