7821212023 has 2 divisors, whose sum is σ = 7821212024. Its totient is φ = 7821212022.

The previous prime is 7821212011. The next prime is 7821212039. The reversal of 7821212023 is 3202121287.

It is a weak prime.

It is an emirp because it is prime and its reverse (3202121287) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 7821212023 - 2²⁹ = 7284341111 is a prime.

It is a super-2 number, since 2×7821212023² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 7821211982 and 7821212000.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (7821218023) 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, 3910606011 + 3910606012.

It is an arithmetic number, because the mean of its divisors is an integer number (3910606012).

Almost surely, 2^7821212023 is an apocalyptic number.

7821212023 is a deficient number, since it is larger than the sum of its proper divisors (1).

7821212023 is an equidigital number, since it uses as much as digits as its factorization.

7821212023 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2688, while the sum is 28.

The square root of 7821212023 is about 88437.6165610539. The cubic root of 7821212023 is about 1984.9886129369.

The spelling of 7821212023 in words is "seven billion, eight hundred twenty-one million, two hundred twelve thousand, twenty-three".