7287304021 has 2 divisors, whose sum is σ = 7287304022. Its totient is φ = 7287304020.

The previous prime is 7287304007. The next prime is 7287304033. The reversal of 7287304021 is 1204037827.

7287304021 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 6429634225 + 857669796 = 80185^2 + 29286^2 .

It is a cyclic number.

It is not a de Polignac number, because 7287304021 - 2¹⁵ = 7287271253 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (7287304001) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3643652010 + 3643652011.

It is an arithmetic number, because the mean of its divisors is an integer number (3643652011).

Almost surely, 2^7287304021 is an apocalyptic number.

It is an amenable number.

7287304021 is a deficient number, since it is larger than the sum of its proper divisors (1).

7287304021 is an equidigital number, since it uses as much as digits as its factorization.

7287304021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 18816, while the sum is 34.

The square root of 7287304021 is about 85365.7075235718. The cubic root of 7287304021 is about 1938.7521664264.

The spelling of 7287304021 in words is "seven billion, two hundred eighty-seven million, three hundred four thousand, twenty-one".