221122225 has 24 divisors (see below), whose sum is σ = 289981440. Its totient is φ = 166992000.

The previous prime is 221122193. The next prime is 221122259. The reversal of 221122225 is 522221122.

221122225 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 221122225 - 2⁵ = 221122193 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 28296 + ... + 35254.

It is an arithmetic number, because the mean of its divisors is an integer number (12082560).

Almost surely, 2^221122225 is an apocalyptic number.

221122225 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

221122225 is a deficient number, since it is larger than the sum of its proper divisors (68859215).

221122225 is a wasteful number, since it uses less digits than its factorization.

221122225 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7041 (or 7036 counting only the distinct ones).

The product of its digits is 320, while the sum is 19.

The square root of 221122225 is about 14870.1790507041. The cubic root of 221122225 is about 604.7057968967.

Adding to 221122225 its reverse (522221122), we get a palindrome (743343347).

The spelling of 221122225 in words is "two hundred twenty-one million, one hundred twenty-two thousand, two hundred twenty-five".