421664503430 has 16 divisors (see below), whose sum is σ = 759004670160. Its totient is φ = 168663898272.

The previous prime is 421664503411. The next prime is 421664503433. The reversal of 421664503430 is 34305466124.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (421664503433) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 998876 + ... + 1356864.

It is an arithmetic number, because the mean of its divisors is an integer number (47437791885).

Almost surely, 2^421664503430 is an apocalyptic number.

421664503430 is a deficient number, since it is larger than the sum of its proper divisors (337340166730).

421664503430 is a wasteful number, since it uses less digits than its factorization.

421664503430 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 475783.

The product of its (nonzero) digits is 207360, while the sum is 38.

Adding to 421664503430 its reverse (34305466124), we get a palindrome (455969969554).

The spelling of 421664503430 in words is "four hundred twenty-one billion, six hundred sixty-four million, five hundred three thousand, four hundred thirty".