324213921 has 10 divisors (see below), whose sum is σ = 484319682. Its totient is φ = 216142560.

The previous prime is 324213913. The next prime is 324213941. The reversal of 324213921 is 129312423.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 263607696 + 60606225 = 16236^2 + 7785^2 .

It is not a de Polignac number, because 324213921 - 2³ = 324213913 is a prime.

It is a super-2 number, since 2×324213921² = 210229333140388482, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is not an unprimeable number, because it can be changed into a prime (324213941) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 2001240 + ... + 2001401.

Almost surely, 2^324213921 is an apocalyptic number.

It is an amenable number.

324213921 is a deficient number, since it is larger than the sum of its proper divisors (160105761).

324213921 is an equidigital number, since it uses as much as digits as its factorization.

324213921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4002653 (or 4002644 counting only the distinct ones).

The product of its digits is 2592, while the sum is 27.

The square root of 324213921 is about 18005.9412694810. The cubic root of 324213921 is about 686.9796717922.

The spelling of 324213921 in words is "three hundred twenty-four million, two hundred thirteen thousand, nine hundred twenty-one".