421020340 has 48 divisors (see below), whose sum is σ = 970150608. Its totient is φ = 152515584.

The previous prime is 421020337. The next prime is 421020389. The reversal of 421020340 is 43020124.

It can be written as a sum of positive squares in 8 ways, for example, as 41705764 + 379314576 = 6458^2 + 19476^2 .

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1497 + ... + 29056.

It is an arithmetic number, because the mean of its divisors is an integer number (20211471).

Almost surely, 2^421020340 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 421020340, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (485075304).

421020340 is an abundant number, since it is smaller than the sum of its proper divisors (549130268).

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

421020340 is a wasteful number, since it uses less digits than its factorization.

421020340 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30628 (or 30626 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 16.

The square root of 421020340 is about 20518.7801781685. The cubic root of 421020340 is about 749.4931924201.

Adding to 421020340 its reverse (43020124), we get a palindrome (464040464).

The spelling of 421020340 in words is "four hundred twenty-one million, twenty thousand, three hundred forty".