128446021 has 12 divisors (see below), whose sum is σ = 141994944. Its totient is φ = 115229400.

The previous prime is 128446013. The next prime is 128446027. The reversal of 128446021 is 120644821.

It is not a de Polignac number, because 128446021 - 2³ = 128446013 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (128446027) 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 in 11 ways as a sum of consecutive naturals, for example, 67716 + ... + 69586.

It is an arithmetic number, because the mean of its divisors is an integer number (11832912).

Almost surely, 2^128446021 is an apocalyptic number.

128446021 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

128446021 is a deficient number, since it is larger than the sum of its proper divisors (13548923).

128446021 is an equidigital number, since it uses as much as digits as its factorization.

128446021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2040 (or 1961 counting only the distinct ones).

The product of its (nonzero) digits is 3072, while the sum is 28.

The square root of 128446021 is about 11333.4028870415. The cubic root of 128446021 is about 504.5531072429.

The spelling of 128446021 in words is "one hundred twenty-eight million, four hundred forty-six thousand, twenty-one".