128034821 has 2 divisors, whose sum is σ = 128034822. Its totient is φ = 128034820.

The previous prime is 128034799. The next prime is 128034839. The reversal of 128034821 is 128430821.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 127938721 + 96100 = 11311^2 + 310^2 .

It is a cyclic number.

It is not a de Polignac number, because 128034821 - 2⁶ = 128034757 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (128031821) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64017410 + 64017411.

It is an arithmetic number, because the mean of its divisors is an integer number (64017411).

Almost surely, 2^128034821 is an apocalyptic number.

It is an amenable number.

128034821 is a deficient number, since it is larger than the sum of its proper divisors (1).

128034821 is an equidigital number, since it uses as much as digits as its factorization.

128034821 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3072, while the sum is 29.

The square root of 128034821 is about 11315.2472796665. The cubic root of 128034821 is about 504.0141155134.

The spelling of 128034821 in words is "one hundred twenty-eight million, thirty-four thousand, eight hundred twenty-one".