324216421 has 4 divisors (see below), whose sum is σ = 324475200. Its totient is φ = 323957644.

The previous prime is 324216413. The next prime is 324216427. The reversal of 324216421 is 124612423.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 124612423 = 13 ⋅9585571.

It is a cyclic number.

It is not a de Polignac number, because 324216421 - 2³ = 324216413 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (324216427) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 127501 + ... + 130018.

It is an arithmetic number, because the mean of its divisors is an integer number (81118800).

Almost surely, 2^324216421 is an apocalyptic number.

It is an amenable number.

324216421 is a deficient number, since it is larger than the sum of its proper divisors (258779).

324216421 is a wasteful number, since it uses less digits than its factorization.

324216421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 258778.

The product of its digits is 2304, while the sum is 25.

The square root of 324216421 is about 18006.0106908776. The cubic root of 324216421 is about 686.9814375449.

Adding to 324216421 its reverse (124612423), we get a palindrome (448828844).

The spelling of 324216421 in words is "three hundred twenty-four million, two hundred sixteen thousand, four hundred twenty-one".