421443312 has 80 divisors (see below), whose sum is σ = 1131371040. Its totient is φ = 135023616.

The previous prime is 421443299. The next prime is 421443353. The reversal of 421443312 is 213344124.

It is a super-2 number, since 2×421443312² = 355228930459058688, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (24).

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

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, 385038 + ... + 386130.

It is an arithmetic number, because the mean of its divisors is an integer number (14142138).

Almost surely, 2^421443312 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 421443312, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (565685520).

421443312 is an abundant number, since it is smaller than the sum of its proper divisors (709927728).

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

421443312 is a wasteful number, since it uses less digits than its factorization.

421443312 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1410 (or 1404 counting only the distinct ones).

The product of its digits is 2304, while the sum is 24.

The square root of 421443312 is about 20529.0845387708. The cubic root of 421443312 is about 749.7440975841.

Adding to 421443312 its reverse (213344124), we get a palindrome (634787436).

The spelling of 421443312 in words is "four hundred twenty-one million, four hundred forty-three thousand, three hundred twelve".