12261521 has 2 divisors, whose sum is σ = 12261522. Its totient is φ = 12261520.

The previous prime is 12261503. The next prime is 12261527. The reversal of 12261521 is 12516221.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 6948496 + 5313025 = 2636^2 + 2305^2 .

It is a cyclic number.

It is not a de Polignac number, because 12261521 - 2²² = 8067217 is a prime.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 12261493 and 12261502.

It is not a weakly prime, because it can be changed into another prime (12261527) by changing a digit.

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 as a sum of consecutive naturals, namely, 6130760 + 6130761.

It is an arithmetic number, because the mean of its divisors is an integer number (6130761).

Almost surely, 2^12261521 is an apocalyptic number.

It is an amenable number.

12261521 is a deficient number, since it is larger than the sum of its proper divisors (1).

12261521 is an equidigital number, since it uses as much as digits as its factorization.

12261521 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 240, while the sum is 20.

The square root of 12261521 is about 3501.6454703468. The cubic root of 12261521 is about 230.5940597638.

Adding to 12261521 its reverse (12516221), we get a palindrome (24777742).

The spelling of 12261521 in words is "twelve million, two hundred sixty-one thousand, five hundred twenty-one".