84828155021 has 2 divisors, whose sum is σ = 84828155022. Its totient is φ = 84828155020.

The previous prime is 84828155017. The next prime is 84828155077. The reversal of 84828155021 is 12055182848.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 84817825225 + 10329796 = 291235^2 + 3214^2 .

It is a cyclic number.

It is not a de Polignac number, because 84828155021 - 2² = 84828155017 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (84828155921) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 42414077510 + 42414077511.

It is an arithmetic number, because the mean of its divisors is an integer number (42414077511).

Almost surely, 2^84828155021 is an apocalyptic number.

It is an amenable number.

84828155021 is a deficient number, since it is larger than the sum of its proper divisors (1).

84828155021 is an equidigital number, since it uses as much as digits as its factorization.

84828155021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 204800, while the sum is 44.

The spelling of 84828155021 in words is "eighty-four billion, eight hundred twenty-eight million, one hundred fifty-five thousand, twenty-one".