23121225 has 18 divisors (see below), whose sum is σ = 41413086. Its totient is φ = 12331200.

The previous prime is 23121209. The next prime is 23121247. The reversal of 23121225 is 52212132.

It can be written as a sum of positive squares in 3 ways, for example, as 7033104 + 16088121 = 2652^2 + 4011^2 .

It is not a de Polignac number, because 23121225 - 2⁴ = 23121209 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 23121198 and 23121207.

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 17 ways as a sum of consecutive naturals, for example, 51156 + ... + 51605.

It is an arithmetic number, because the mean of its divisors is an integer number (2300727).

Almost surely, 2^23121225 is an apocalyptic number.

23121225 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

23121225 is a deficient number, since it is larger than the sum of its proper divisors (18291861).

23121225 is a wasteful number, since it uses less digits than its factorization.

23121225 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 102777 (or 102769 counting only the distinct ones).

The product of its digits is 240, while the sum is 18.

The square root of 23121225 is about 4808.4534935881. The cubic root of 23121225 is about 284.8854572027.

Adding to 23121225 its reverse (52212132), we get a palindrome (75333357).

The spelling of 23121225 in words is "twenty-three million, one hundred twenty-one thousand, two hundred twenty-five".