421130820 has 288 divisors, whose sum is σ = 1415715840. Its totient is φ = 93139200.

The previous prime is 421130819. The next prime is 421130861. The reversal of 421130820 is 28031124.

It is a congruent number.

It is an unprimeable number.

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 95 ways as a sum of consecutive naturals, for example, 5931385 + ... + 5931455.

It is an arithmetic number, because the mean of its divisors is an integer number (4915680).

Almost surely, 2^421130820 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 421130820, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (707857920).

421130820 is an abundant number, since it is smaller than the sum of its proper divisors (994585020).

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

421130820 is a wasteful number, since it uses less digits than its factorization.

421130820 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 167 (or 154 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 21.

The square root of 421130820 is about 20521.4721694132. The cubic root of 421130820 is about 749.5587448873.

Adding to 421130820 its reverse (28031124), we get a palindrome (449161944).

The spelling of 421130820 in words is "four hundred twenty-one million, one hundred thirty thousand, eight hundred twenty".