22381225 has 12 divisors (see below), whose sum is σ = 28648960. Its totient is φ = 17326800.

The previous prime is 22381223. The next prime is 22381241. The reversal of 22381225 is 52218322.

It is not a de Polignac number, because 22381225 - 2¹ = 22381223 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (25).

It is a self number, because there is not a number n which added to its sum of digits gives 22381225.

It is not an unprimeable number, because it can be changed into a prime (22381223) by changing a digit.

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 11 ways as a sum of consecutive naturals, for example, 13665 + ... + 15214.

Almost surely, 2^22381225 is an apocalyptic number.

22381225 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

22381225 is a deficient number, since it is larger than the sum of its proper divisors (6267735).

22381225 is a wasteful number, since it uses less digits than its factorization.

22381225 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28920 (or 28915 counting only the distinct ones).

The product of its digits is 1920, while the sum is 25.

The square root of 22381225 is about 4730.8799392925. The cubic root of 22381225 is about 281.8131695101.

Adding to 22381225 its reverse (52218322), we get a palindrome (74599547).

The spelling of 22381225 in words is "twenty-two million, three hundred eighty-one thousand, two hundred twenty-five".