421100020 has 48 divisors (see below), whose sum is σ = 976953600. Its totient is φ = 151182720.

The previous prime is 421100011. The next prime is 421100033. The reversal of 421100020 is 20001124.

It is a Harshad number since it is a multiple of its sum of digits (10).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5266 + ... + 29494.

It is an arithmetic number, because the mean of its divisors is an integer number (20353200).

Almost surely, 2^421100020 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 421100020, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (488476800).

421100020 is an abundant number, since it is smaller than the sum of its proper divisors (555853580).

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

421100020 is a wasteful number, since it uses less digits than its factorization.

421100020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24328 (or 24326 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 10.

The square root of 421100020 is about 20520.7217222007. The cubic root of 421100020 is about 749.5404710943.

Adding to 421100020 its reverse (20001124), we get a palindrome (441101144).

The spelling of 421100020 in words is "four hundred twenty-one million, one hundred thousand, twenty".