421521032 has 16 divisors (see below), whose sum is σ = 817605900. Its totient is φ = 203492800.

The previous prime is 421521029. The next prime is 421521047. The reversal of 421521032 is 230125124.

It can be written as a sum of positive squares in 2 ways, for example, as 415099876 + 6421156 = 20374^2 + 2534^2 .

It is a junction number, because it is equal to n+sod(n) for n = 421520995 and 421521013.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 908219 + ... + 908682.

Almost surely, 2^421521032 is an apocalyptic number.

It is an amenable number.

421521032 is a deficient number, since it is larger than the sum of its proper divisors (396084868).

421521032 is a wasteful number, since it uses less digits than its factorization.

421521032 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1816936 (or 1816932 counting only the distinct ones).

The product of its (nonzero) digits is 480, while the sum is 20.

The square root of 421521032 is about 20530.9773756633. The cubic root of 421521032 is about 749.7901824928.

Adding to 421521032 its reverse (230125124), we get a palindrome (651646156).

The spelling of 421521032 in words is "four hundred twenty-one million, five hundred twenty-one thousand, thirty-two".