421510243 has 16 divisors (see below), whose sum is σ = 526636800. Its totient is φ = 327751200.

The previous prime is 421510211. The next prime is 421510261. The reversal of 421510243 is 342015124.

It is not a de Polignac number, because 421510243 - 2⁵ = 421510211 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (421510283) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 32233 + ... + 43381.

It is an arithmetic number, because the mean of its divisors is an integer number (32914800).

Almost surely, 2^421510243 is an apocalyptic number.

421510243 is a deficient number, since it is larger than the sum of its proper divisors (105126557).

421510243 is a wasteful number, since it uses less digits than its factorization.

421510243 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11658.

The product of its (nonzero) digits is 960, while the sum is 22.

The square root of 421510243 is about 20530.7146246788. The cubic root of 421510243 is about 749.7837853780.

Adding to 421510243 its reverse (342015124), we get a palindrome (763525367).

The spelling of 421510243 in words is "four hundred twenty-one million, five hundred ten thousand, two hundred forty-three".