421415443 has 4 divisors (see below), whose sum is σ = 435947040. Its totient is φ = 406883848.

The previous prime is 421415413. The next prime is 421415471. The reversal of 421415443 is 344514124.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 421415443 - 2⁵ = 421415411 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (421415413) 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, 7265755 + ... + 7265812.

It is an arithmetic number, because the mean of its divisors is an integer number (108986760).

Almost surely, 2^421415443 is an apocalyptic number.

421415443 is a deficient number, since it is larger than the sum of its proper divisors (14531597).

421415443 is a wasteful number, since it uses less digits than its factorization.

421415443 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14531596.

The product of its digits is 7680, while the sum is 28.

The square root of 421415443 is about 20528.4057588503. The cubic root of 421415443 is about 749.7275709811.

Adding to 421415443 its reverse (344514124), we get a palindrome (765929567).

The spelling of 421415443 in words is "four hundred twenty-one million, four hundred fifteen thousand, four hundred forty-three".