7202130721 has 4 divisors (see below), whose sum is σ = 7202676292. Its totient is φ = 7201585152.

The previous prime is 7202130679. The next prime is 7202130751. The reversal of 7202130721 is 1270312027.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 5283690721 + 1918440000 = 72689^2 + 43800^2 .

It is a cyclic number.

It is not a de Polignac number, because 7202130721 - 2⁹ = 7202130209 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (7202130751) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 252480 + ... + 279553.

It is an arithmetic number, because the mean of its divisors is an integer number (1800669073).

Almost surely, 2^7202130721 is an apocalyptic number.

It is an amenable number.

7202130721 is a deficient number, since it is larger than the sum of its proper divisors (545571).

7202130721 is a wasteful number, since it uses less digits than its factorization.

7202130721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 545570.

The product of its (nonzero) digits is 1176, while the sum is 25.

The square root of 7202130721 is about 84865.3682075321. The cubic root of 7202130721 is about 1931.1692308418.

Adding to 7202130721 its reverse (1270312027), we get a palindrome (8472442748).

The spelling of 7202130721 in words is "seven billion, two hundred two million, one hundred thirty thousand, seven hundred twenty-one".