12225521 has 16 divisors (see below), whose sum is σ = 15344640. Its totient is φ = 9462480.

The previous prime is 12225491. The next prime is 12225527. The reversal of 12225521 is 12552221.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 12225521 - 2¹⁰ = 12224497 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 12225493 and 12225502.

It is not an unprimeable number, because it can be changed into a prime (12225527) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 13340 + ... + 14226.

It is an arithmetic number, because the mean of its divisors is an integer number (959040).

Almost surely, 2^12225521 is an apocalyptic number.

12225521 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

12225521 is a deficient number, since it is larger than the sum of its proper divisors (3119119).

12225521 is a wasteful number, since it uses less digits than its factorization.

12225521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1084.

The product of its digits is 400, while the sum is 20.

The square root of 12225521 is about 3496.5012512510. The cubic root of 12225521 is about 230.3681627277.

Adding to 12225521 its reverse (12552221), we get a palindrome (24777742).

The spelling of 12225521 in words is "twelve million, two hundred twenty-five thousand, five hundred twenty-one".