225557321 has 8 divisors (see below), whose sum is σ = 250097088. Its totient is φ = 201690000.

The previous prime is 225557279. The next prime is 225557323. The reversal of 225557321 is 123755522.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 225557321 - 2⁶ = 225557257 is a prime.

It is a super-2 number, since 2×225557321² = 101752210113394082, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (225557323) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 167405 + ... + 168746.

It is an arithmetic number, because the mean of its divisors is an integer number (31262136).

Almost surely, 2^225557321 is an apocalyptic number.

It is an amenable number.

225557321 is a deficient number, since it is larger than the sum of its proper divisors (24539767).

225557321 is a wasteful number, since it uses less digits than its factorization.

225557321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 336223.

The product of its digits is 21000, while the sum is 32.

The square root of 225557321 is about 15018.5658769404. The cubic root of 225557321 is about 608.7219690342.

The spelling of 225557321 in words is "two hundred twenty-five million, five hundred fifty-seven thousand, three hundred twenty-one".