2230721 has 2 divisors, whose sum is σ = 2230722. Its totient is φ = 2230720.

The previous prime is 2230699. The next prime is 2230727. The reversal of 2230721 is 1270322.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 2070721 + 160000 = 1439^2 + 400^2 .

It is a cyclic number.

It is not a de Polignac number, because 2230721 - 2¹⁰ = 2229697 is a prime.

It is a super-3 number, since 3×2230721³ = 33300980582433286083, which contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a self number, because there is not a number n which added to its sum of digits gives 2230721.

It is not a weakly prime, because it can be changed into another prime (2230727) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1115360 + 1115361.

It is an arithmetic number, because the mean of its divisors is an integer number (1115361).

2^2230721 is an apocalyptic number.

It is an amenable number.

2230721 is a deficient number, since it is larger than the sum of its proper divisors (1).

2230721 is an equidigital number, since it uses as much as digits as its factorization.

2230721 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 168, while the sum is 17.

The square root of 2230721 is about 1493.5598414526. The cubic root of 2230721 is about 130.6617343631.

The spelling of 2230721 in words is "two million, two hundred thirty thousand, seven hundred twenty-one".