421820412 has 48 divisors (see below), whose sum is σ = 1069383840. Its totient is φ = 128636928.

The previous prime is 421820389. The next prime is 421820417. The reversal of 421820412 is 214028124.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (421820417) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5664 + ... + 29592.

It is an arithmetic number, because the mean of its divisors is an integer number (22278830).

Almost surely, 2^421820412 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 421820412, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (534691920).

421820412 is an abundant number, since it is smaller than the sum of its proper divisors (647563428).

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

421820412 is a wasteful number, since it uses less digits than its factorization.

421820412 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24062 (or 24060 counting only the distinct ones).

The product of its (nonzero) digits is 1024, while the sum is 24.

The square root of 421820412 is about 20538.2670155006. The cubic root of 421820412 is about 749.9676501602.

Adding to 421820412 its reverse (214028124), we get a palindrome (635848536).

The spelling of 421820412 in words is "four hundred twenty-one million, eight hundred twenty thousand, four hundred twelve".