421404502234 has 4 divisors (see below), whose sum is σ = 632106753354. Its totient is φ = 210702251116.

The previous prime is 421404502187. The next prime is 421404502237. The reversal of 421404502234 is 432205404124.

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

It can be written as a sum of positive squares in only one way, i.e., 404181877009 + 17222625225 = 635753^2 + 131235^2 .

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a junction number, because it is equal to n+sod(n) for n = 421404502196 and 421404502205.

It is not an unprimeable number, because it can be changed into a prime (421404502237) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 105351125557 + ... + 105351125560.

Almost surely, 2^421404502234 is an apocalyptic number.

421404502234 is a deficient number, since it is larger than the sum of its proper divisors (210702251120).

421404502234 is a wasteful number, since it uses less digits than its factorization.

421404502234 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 210702251119.

The product of its (nonzero) digits is 30720, while the sum is 31.

Adding to 421404502234 its reverse (432205404124), we get a palindrome (853609906358).

The spelling of 421404502234 in words is "four hundred twenty-one billion, four hundred four million, five hundred two thousand, two hundred thirty-four".