7221251 has 2 divisors, whose sum is σ = 7221252. Its totient is φ = 7221250.

The previous prime is 7221199. The next prime is 7221257. The reversal of 7221251 is 1521227.

It is a strong prime.

It is an emirp because it is prime and its reverse (1521227) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-7221251 is a prime.

It is not a weakly prime, because it can be changed into another prime (7221257) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3610625 + 3610626.

It is an arithmetic number, because the mean of its divisors is an integer number (3610626).

Almost surely, 2^7221251 is an apocalyptic number.

7221251 is a deficient number, since it is larger than the sum of its proper divisors (1).

7221251 is an equidigital number, since it uses as much as digits as its factorization.

7221251 is an odious number, because the sum of its binary digits is odd.

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

The square root of 7221251 is about 2687.2385454217. The cubic root of 7221251 is about 193.2876682345.

Adding to 7221251 its reverse (1521227), we get a palindrome (8742478).

The spelling of 7221251 in words is "seven million, two hundred twenty-one thousand, two hundred fifty-one".