7821212071 has 2 divisors, whose sum is σ = 7821212072. Its totient is φ = 7821212070.

The previous prime is 7821212057. The next prime is 7821212089. The reversal of 7821212071 is 1702121287.

It is a weak prime.

It is an emirp because it is prime and its reverse (1702121287) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 7821212071 - 2⁵ = 7821212039 is a prime.

It is a super-2 number, since 2×7821212071² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (7821212011) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3910606035 + 3910606036.

It is an arithmetic number, because the mean of its divisors is an integer number (3910606036).

Almost surely, 2^7821212071 is an apocalyptic number.

7821212071 is a deficient number, since it is larger than the sum of its proper divisors (1).

7821212071 is an equidigital number, since it uses as much as digits as its factorization.

7821212071 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3136, while the sum is 31.

The square root of 7821212071 is about 88437.6168324317. The cubic root of 7821212071 is about 1984.9886169976.

The spelling of 7821212071 in words is "seven billion, eight hundred twenty-one million, two hundred twelve thousand, seventy-one".