421643324 has 24 divisors (see below), whose sum is σ = 743586480. Its totient is φ = 209197184.

The previous prime is 421643309. The next prime is 421643353. The reversal of 421643324 is 423346124.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 361967 + ... + 363129.

It is an arithmetic number, because the mean of its divisors is an integer number (30982770).

Almost surely, 2^421643324 is an apocalyptic number.

It is an amenable number.

421643324 is a deficient number, since it is larger than the sum of its proper divisors (321943156).

421643324 is a wasteful number, since it uses less digits than its factorization.

421643324 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1789 (or 1787 counting only the distinct ones).

The product of its digits is 13824, while the sum is 29.

The square root of 421643324 is about 20533.9553910103. The cubic root of 421643324 is about 749.8626853796.

Adding to 421643324 its reverse (423346124), we get a palindrome (844989448).

The spelling of 421643324 in words is "four hundred twenty-one million, six hundred forty-three thousand, three hundred twenty-four".