7821210533 has 2 divisors, whose sum is σ = 7821210534. Its totient is φ = 7821210532.

The previous prime is 7821210499. The next prime is 7821210571. The reversal of 7821210533 is 3350121287.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 4180656964 + 3640553569 = 64658^2 + 60337^2 .

It is a cyclic number.

It is not a de Polignac number, because 7821210533 - 2⁸ = 7821210277 is a prime.

It is a super-2 number, since 2×7821210533² (a number of 21 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 7821210533.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (7821210233) 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 as a sum of consecutive naturals, namely, 3910605266 + 3910605267.

It is an arithmetic number, because the mean of its divisors is an integer number (3910605267).

Almost surely, 2^7821210533 is an apocalyptic number.

It is an amenable number.

7821210533 is a deficient number, since it is larger than the sum of its proper divisors (1).

7821210533 is an equidigital number, since it uses as much as digits as its factorization.

7821210533 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 10080, while the sum is 32.

The square root of 7821210533 is about 88437.6081370364. The cubic root of 7821210533 is about 1984.9884868851.

The spelling of 7821210533 in words is "seven billion, eight hundred twenty-one million, two hundred ten thousand, five hundred thirty-three".