421821936 has 120 divisors (see below), whose sum is σ = 1236952080. Its totient is φ = 134012928.

The previous prime is 421821931. The next prime is 421821937. The reversal of 421821936 is 639128124.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a nude number because it is divisible by every one of its digits.

It is a self number, because there is not a number n which added to its sum of digits gives 421821936.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (421821931) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 346000 + ... + 347216.

It is an arithmetic number, because the mean of its divisors is an integer number (10307934).

Almost surely, 2^421821936 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 421821936, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (618476040).

421821936 is an abundant number, since it is smaller than the sum of its proper divisors (815130144).

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

421821936 is a wasteful number, since it uses less digits than its factorization.

421821936 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1343 (or 1334 counting only the distinct ones).

The product of its digits is 20736, while the sum is 36.

The square root of 421821936 is about 20538.3041169421. The cubic root of 421821936 is about 749.9685533482.

The spelling of 421821936 in words is "four hundred twenty-one million, eight hundred twenty-one thousand, nine hundred thirty-six".