225721223 has 32 divisors (see below), whose sum is σ = 299811456. Its totient is φ = 164855808.

The previous prime is 225721219. The next prime is 225721247. The reversal of 225721223 is 322127522.

It is not a de Polignac number, because 225721223 - 2² = 225721219 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 225721192 and 225721201.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (225720223) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 80615 + ... + 83367.

It is an arithmetic number, because the mean of its divisors is an integer number (9369108).

Almost surely, 2^225721223 is an apocalyptic number.

225721223 is a deficient number, since it is larger than the sum of its proper divisors (74090233).

225721223 is a wasteful number, since it uses less digits than its factorization.

225721223 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2843.

The product of its digits is 3360, while the sum is 26.

The square root of 225721223 is about 15024.0215321997. The cubic root of 225721223 is about 608.8693766366.

Adding to 225721223 its reverse (322127522), we get a palindrome (547848745).

The spelling of 225721223 in words is "two hundred twenty-five million, seven hundred twenty-one thousand, two hundred twenty-three".