23218225 has 12 divisors (see below), whose sum is σ = 29720320. Its totient is φ = 17974800.

The previous prime is 23218219. The next prime is 23218249. The reversal of 23218225 is 52281232.

It is not a de Polignac number, because 23218225 - 2⁵ = 23218193 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 23218225.

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, 14205 + ... + 15754.

Almost surely, 2^23218225 is an apocalyptic number.

23218225 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

23218225 is a deficient number, since it is larger than the sum of its proper divisors (6502095).

23218225 is a wasteful number, since it uses less digits than its factorization.

23218225 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30000 (or 29995 counting only the distinct ones).

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

The square root of 23218225 is about 4818.5293399543. The cubic root of 23218225 is about 285.2832927441.

Adding to 23218225 its reverse (52281232), we get a palindrome (75499457).

The spelling of 23218225 in words is "twenty-three million, two hundred eighteen thousand, two hundred twenty-five".