7200240821 has 2 divisors, whose sum is σ = 7200240822. Its totient is φ = 7200240820.

The previous prime is 7200240799. The next prime is 7200240829. The reversal of 7200240821 is 1280420027.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 6887340100 + 312900721 = 82990^2 + 17689^2 .

It is a cyclic number.

It is not a de Polignac number, because 7200240821 - 2¹⁰ = 7200239797 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (7200240829) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3600120410 + 3600120411.

It is an arithmetic number, because the mean of its divisors is an integer number (3600120411).

Almost surely, 2^7200240821 is an apocalyptic number.

It is an amenable number.

7200240821 is a deficient number, since it is larger than the sum of its proper divisors (1).

7200240821 is an equidigital number, since it uses as much as digits as its factorization.

7200240821 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1792, while the sum is 26.

The square root of 7200240821 is about 84854.2327818713. The cubic root of 7200240821 is about 1931.0002976860. Note that the first 3 decimals are identical.

Adding to 7200240821 its reverse (1280420027), we get a palindrome (8480660848).

The spelling of 7200240821 in words is "seven billion, two hundred million, two hundred forty thousand, eight hundred twenty-one".