421555128 has 32 divisors (see below), whose sum is σ = 1109356800. Its totient is φ = 133122528.

The previous prime is 421555067. The next prime is 421555129. The reversal of 421555128 is 821555124.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (421555129) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 461776 + ... + 462687.

It is an arithmetic number, because the mean of its divisors is an integer number (34667400).

Almost surely, 2^421555128 is an apocalyptic number.

It is an amenable number.

421555128 is an abundant number, since it is smaller than the sum of its proper divisors (687801672).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

421555128 is a wasteful number, since it uses less digits than its factorization.

421555128 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 924491 (or 924487 counting only the distinct ones).

The product of its digits is 16000, while the sum is 33.

The square root of 421555128 is about 20531.8077138863. The cubic root of 421555128 is about 749.8103982945.

The spelling of 421555128 in words is "four hundred twenty-one million, five hundred fifty-five thousand, one hundred twenty-eight".