22221225 has 72 divisors (see below), whose sum is σ = 43872192. Its totient is φ = 10684800.

The previous prime is 22221211. The next prime is 22221233. The reversal of 22221225 is 52212222.

It is not a de Polignac number, because 22221225 - 2⁴ = 22221209 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 22221198 and 22221207.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 207622 + ... + 207728.

It is an arithmetic number, because the mean of its divisors is an integer number (609336).

Almost surely, 2^22221225 is an apocalyptic number.

22221225 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

22221225 is a deficient number, since it is larger than the sum of its proper divisors (21650967).

22221225 is a wasteful number, since it uses less digits than its factorization.

22221225 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 207 (or 199 counting only the distinct ones).

The product of its digits is 320, while the sum is 18.

The square root of 22221225 is about 4713.9394353343. The cubic root of 22221225 is about 281.1400162554.

Adding to 22221225 its reverse (52212222), we get a palindrome (74433447).

The spelling of 22221225 in words is "twenty-two million, two hundred twenty-one thousand, two hundred twenty-five".