221224325 has 24 divisors (see below), whose sum is σ = 324324480. Its totient is φ = 146462400.

The previous prime is 221224321. The next prime is 221224337. The reversal of 221224325 is 523422122.

It is not a de Polignac number, because 221224325 - 2² = 221224321 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 221224325.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221224321) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 16721 + ... + 26870.

It is an arithmetic number, because the mean of its divisors is an integer number (13513520).

Almost surely, 2^221224325 is an apocalyptic number.

221224325 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

221224325 is a deficient number, since it is larger than the sum of its proper divisors (103100155).

221224325 is a wasteful number, since it uses less digits than its factorization.

221224325 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 43637 (or 43632 counting only the distinct ones).

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

The square root of 221224325 is about 14873.6116999201. The cubic root of 221224325 is about 604.7988539706.

Adding to 221224325 its reverse (523422122), we get a palindrome (744646447).

The spelling of 221224325 in words is "two hundred twenty-one million, two hundred twenty-four thousand, three hundred twenty-five".