7227721 has 2 divisors, whose sum is σ = 7227722. Its totient is φ = 7227720.

The previous prime is 7227719. The next prime is 7227739. The reversal of 7227721 is 1277227.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 7209225 + 18496 = 2685^2 + 136^2 .

It is a cyclic number.

It is not a de Polignac number, because 7227721 - 2¹ = 7227719 is a prime.

Together with 7227719, it forms a pair of twin primes.

It is a self number, because there is not a number n which added to its sum of digits gives 7227721.

It is not a weakly prime, because it can be changed into another prime (7227751) 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, 3613860 + 3613861.

It is an arithmetic number, because the mean of its divisors is an integer number (3613861).

Almost surely, 2^7227721 is an apocalyptic number.

It is an amenable number.

7227721 is a deficient number, since it is larger than the sum of its proper divisors (1).

7227721 is an equidigital number, since it uses as much as digits as its factorization.

7227721 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2744, while the sum is 28.

The square root of 7227721 is about 2688.4421139389. The cubic root of 7227721 is about 193.3453774370.

The spelling of 7227721 in words is "seven million, two hundred twenty-seven thousand, seven hundred twenty-one".