421042340 has 12 divisors (see below), whose sum is σ = 884188956. Its totient is φ = 168416928.

The previous prime is 421042339. The next prime is 421042343. The reversal of 421042340 is 43240124.

It can be written as a sum of positive squares in 2 ways, for example, as 202948516 + 218093824 = 14246^2 + 14768^2 .

It is a Harshad number since it is a multiple of its sum of digits (20), and also a Moran number because the ratio is a prime number: 21052117 = 421042340 / (4 + 2 + 1 + 0 + 4 + 2 + 3 + 4 + 0).

It is not an unprimeable number, because it can be changed into a prime (421042343) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 10526039 + ... + 10526078.

It is an arithmetic number, because the mean of its divisors is an integer number (73682413).

Almost surely, 2^421042340 is an apocalyptic number.

It is an amenable number.

421042340 is an abundant number, since it is smaller than the sum of its proper divisors (463146616).

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

421042340 is a wasteful number, since it uses less digits than its factorization.

421042340 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21052126 (or 21052124 counting only the distinct ones).

The product of its (nonzero) digits is 768, while the sum is 20.

The square root of 421042340 is about 20519.3162654120. The cubic root of 421042340 is about 749.5062468670.

Adding to 421042340 its reverse (43240124), we get a palindrome (464282464).

It can be divided in two parts, 42104 and 2340, that added together give a palindrome (44444).

The spelling of 421042340 in words is "four hundred twenty-one million, forty-two thousand, three hundred forty".