398720524021 has 2 divisors, whose sum is σ = 398720524022. Its totient is φ = 398720524020.

The previous prime is 398720524001. The next prime is 398720524049. The reversal of 398720524021 is 120425027893.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 397744648900 + 975875121 = 630670^2 + 31239^2 .

It is a cyclic number.

It is not a de Polignac number, because 398720524021 - 2⁷ = 398720523893 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (398720524001) 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, 199360262010 + 199360262011.

It is an arithmetic number, because the mean of its divisors is an integer number (199360262011).

Almost surely, 2^398720524021 is an apocalyptic number.

It is an amenable number.

398720524021 is a deficient number, since it is larger than the sum of its proper divisors (1).

398720524021 is an equidigital number, since it uses as much as digits as its factorization.

398720524021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 241920, while the sum is 43.

The spelling of 398720524021 in words is "three hundred ninety-eight billion, seven hundred twenty million, five hundred twenty-four thousand, twenty-one".