221322225 has 12 divisors (see below), whose sum is σ = 365919536. Its totient is φ = 118038480.

The previous prime is 221322193. The next prime is 221322293. The reversal of 221322225 is 522223122.

It is not a de Polignac number, because 221322225 - 2⁵ = 221322193 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1475407 + ... + 1475556.

Almost surely, 2^221322225 is an apocalyptic number.

221322225 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

221322225 is a deficient number, since it is larger than the sum of its proper divisors (144597311).

221322225 is a wasteful number, since it uses less digits than its factorization.

221322225 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2950976 (or 2950971 counting only the distinct ones).

The product of its digits is 960, while the sum is 21.

The square root of 221322225 is about 14876.9023993572. The cubic root of 221322225 is about 604.8880561500. Note that the first 3 decimals are identical.

Adding to 221322225 its reverse (522223122), we get a palindrome (743545347).

The spelling of 221322225 in words is "two hundred twenty-one million, three hundred twenty-two thousand, two hundred twenty-five".