421405242 has 8 divisors (see below), whose sum is σ = 842810496. Its totient is φ = 140468412.

The previous prime is 421405223. The next prime is 421405249. The reversal of 421405242 is 242504124.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

421405242 is an admirable number.

It is not an unprimeable number, because it can be changed into a prime (421405249) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 35117098 + ... + 35117109.

It is an arithmetic number, because the mean of its divisors is an integer number (105351312).

Almost surely, 2^421405242 is an apocalyptic number.

421405242 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

421405242 is a wasteful number, since it uses less digits than its factorization.

421405242 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 70234212.

The product of its (nonzero) digits is 2560, while the sum is 24.

The square root of 421405242 is about 20528.1572967473. The cubic root of 421405242 is about 749.7215215013.

Adding to 421405242 its reverse (242504124), we get a palindrome (663909366).

The spelling of 421405242 in words is "four hundred twenty-one million, four hundred five thousand, two hundred forty-two".