12021525 has 54 divisors (see below), whose sum is σ = 22731618. Its totient is φ = 6072000.

The previous prime is 12021491. The next prime is 12021539. The reversal of 12021525 is 52512021.

12021525 is a `hidden beast` number, since 120 + 21 + 525 = 666.

It can be written as a sum of positive squares in 3 ways, for example, as 3218436 + 8803089 = 1794^2 + 2967^2 .

It is not a de Polignac number, because 12021525 - 2⁹ = 12021013 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 12021498 and 12021507.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 53 ways as a sum of consecutive naturals, for example, 118975 + ... + 119075.

Almost surely, 2^12021525 is an apocalyptic number.

12021525 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

12021525 is a deficient number, since it is larger than the sum of its proper divisors (10710093).

12021525 is a wasteful number, since it uses less digits than its factorization.

12021525 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 163 (or 132 counting only the distinct ones).

The product of its (nonzero) digits is 200, while the sum is 18.

The square root of 12021525 is about 3467.2070892867. The cubic root of 12021525 is about 229.0796554889.

Adding to 12021525 its reverse (52512021), we get a palindrome (64533546).

The spelling of 12021525 in words is "twelve million, twenty-one thousand, five hundred twenty-five".