12012521 has 2 divisors, whose sum is σ = 12012522. Its totient is φ = 12012520.

The previous prime is 12012493. The next prime is 12012527. The reversal of 12012521 is 12521021.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 11999296 + 13225 = 3464^2 + 115^2 .

It is an emirp because it is prime and its reverse (12521021) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 12012521 - 2¹⁸ = 11750377 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 12012496 and 12012505.

It is not a weakly prime, because it can be changed into another prime (12012527) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6006260 + 6006261.

It is an arithmetic number, because the mean of its divisors is an integer number (6006261).

Almost surely, 2^12012521 is an apocalyptic number.

It is an amenable number.

12012521 is a deficient number, since it is larger than the sum of its proper divisors (1).

12012521 is an equidigital number, since it uses as much as digits as its factorization.

12012521 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 40, while the sum is 14.

The square root of 12012521 is about 3465.9083946348. The cubic root of 12012521 is about 229.0224484264.

Adding to 12012521 its reverse (12521021), we get a palindrome (24533542).

The spelling of 12012521 in words is "twelve million, twelve thousand, five hundred twenty-one".