325224221 has 6 divisors (see below), whose sum is σ = 378322110. Its totient is φ = 278763576.

The previous prime is 325224199. The next prime is 325224247. The reversal of 325224221 is 122422523.

It can be written as a sum of positive squares in only one way, i.e., 324396121 + 828100 = 18011^2 + 910^2 .

It is not a de Polignac number, because 325224221 - 2⁶ = 325224157 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 (325224421) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 3318566 + ... + 3318663.

It is an arithmetic number, because the mean of its divisors is an integer number (63053685).

Almost surely, 2^325224221 is an apocalyptic number.

It is an amenable number.

325224221 is a deficient number, since it is larger than the sum of its proper divisors (53097889).

325224221 is an equidigital number, since it uses as much as digits as its factorization.

325224221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6637243 (or 6637236 counting only the distinct ones).

The product of its digits is 1920, while the sum is 23.

The square root of 325224221 is about 18033.9740767253. The cubic root of 325224221 is about 687.6925096598.

Adding to 325224221 its reverse (122422523), we get a palindrome (447646744).

The spelling of 325224221 in words is "three hundred twenty-five million, two hundred twenty-four thousand, two hundred twenty-one".