421128820 has 48 divisors (see below), whose sum is σ = 1038038400. Its totient is φ = 140482944.

The previous prime is 421128817. The next prime is 421128823. The reversal of 421128820 is 28821124.

It is an interprime number because it is at equal distance from previous prime (421128817) and next prime (421128823).

It is a Harshad number since it is a multiple of its sum of digits (28).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (421128823) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 35470 + ... + 45829.

It is an arithmetic number, because the mean of its divisors is an integer number (21625800).

Almost surely, 2^421128820 is an apocalyptic number.

It is an amenable number.

421128820 is an abundant number, since it is smaller than the sum of its proper divisors (616909580).

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

421128820 is a wasteful number, since it uses less digits than its factorization.

421128820 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 81352 (or 81350 counting only the distinct ones).

The product of its (nonzero) digits is 2048, while the sum is 28.

The square root of 421128820 is about 20521.4234399079. The cubic root of 421128820 is about 749.5575583044.

Adding to 421128820 its reverse (28821124), we get a palindrome (449949944).

The spelling of 421128820 in words is "four hundred twenty-one million, one hundred twenty-eight thousand, eight hundred twenty".