7152221 has 2 divisors, whose sum is σ = 7152222. Its totient is φ = 7152220.

The previous prime is 7152203. The next prime is 7152239. The reversal of 7152221 is 1222517.

It is a balanced prime because it is at equal distance from previous prime (7152203) and next prime (7152239).

It can be written as a sum of positive squares in only one way, i.e., 6832996 + 319225 = 2614^2 + 565^2 .

It is a cyclic number.

It is not a de Polignac number, because 7152221 - 2¹⁸ = 6890077 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 7152193 and 7152202.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (7152251) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3576110 + 3576111.

It is an arithmetic number, because the mean of its divisors is an integer number (3576111).

Almost surely, 2^7152221 is an apocalyptic number.

It is an amenable number.

7152221 is a deficient number, since it is larger than the sum of its proper divisors (1).

7152221 is an equidigital number, since it uses as much as digits as its factorization.

7152221 is an evil number, because the sum of its binary digits is even.

The product of its digits is 280, while the sum is 20.

The square root of 7152221 is about 2674.3636626308. The cubic root of 7152221 is about 192.6697978975.

Adding to 7152221 its reverse (1222517), we get a palindrome (8374738).

The spelling of 7152221 in words is "seven million, one hundred fifty-two thousand, two hundred twenty-one".