7868364821 has 2 divisors, whose sum is σ = 7868364822. Its totient is φ = 7868364820.

The previous prime is 7868364739. The next prime is 7868364839. The reversal of 7868364821 is 1284638687.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 6759141796 + 1109223025 = 82214^2 + 33305^2 .

It is a cyclic number.

It is not a de Polignac number, because 7868364821 - 2¹⁴ = 7868348437 is a prime.

It is a super-2 number, since 2×7868364821² (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 (7868363821) 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, 3934182410 + 3934182411.

It is an arithmetic number, because the mean of its divisors is an integer number (3934182411).

Almost surely, 2^7868364821 is an apocalyptic number.

It is an amenable number.

7868364821 is a deficient number, since it is larger than the sum of its proper divisors (1).

7868364821 is an equidigital number, since it uses as much as digits as its factorization.

7868364821 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3096576, while the sum is 53.

The square root of 7868364821 is about 88703.8038699581. The cubic root of 7868364821 is about 1988.9696796024.

The spelling of 7868364821 in words is "seven billion, eight hundred sixty-eight million, three hundred sixty-four thousand, eight hundred twenty-one".