8400286820021 has 2 divisors, whose sum is σ = 8400286820022. Its totient is φ = 8400286820020.

The previous prime is 8400286819961. The next prime is 8400286820063. The reversal of 8400286820021 is 1200286820048.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 6609213163921 + 1791073656100 = 2570839^2 + 1338310^2 .

It is a cyclic number.

It is not a de Polignac number, because 8400286820021 - 2¹⁰ = 8400286818997 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (8400286820071) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4200143410010 + 4200143410011.

It is an arithmetic number, because the mean of its divisors is an integer number (4200143410011).

Almost surely, 2^{8400286820021} is an apocalyptic number.

It is an amenable number.

8400286820021 is a deficient number, since it is larger than the sum of its proper divisors (1).

8400286820021 is an equidigital number, since it uses as much as digits as its factorization.

8400286820021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 98304, while the sum is 41.

The spelling of 8400286820021 in words is "eight trillion, four hundred billion, two hundred eighty-six million, eight hundred twenty thousand, twenty-one".