12440521 has 2 divisors, whose sum is σ = 12440522. Its totient is φ = 12440520.

The previous prime is 12440513. The next prime is 12440537. The reversal of 12440521 is 12504421.

12440521 is nontrivially palindromic in base 13.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 6969600 + 5470921 = 2640^2 + 2339^2 .

It is a cyclic number.

It is not a de Polignac number, because 12440521 - 2³ = 12440513 is a prime.

It is not a weakly prime, because it can be changed into another prime (12440551) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6220260 + 6220261.

It is an arithmetic number, because the mean of its divisors is an integer number (6220261).

Almost surely, 2^12440521 is an apocalyptic number.

It is an amenable number.

12440521 is a deficient number, since it is larger than the sum of its proper divisors (1).

12440521 is an equidigital number, since it uses as much as digits as its factorization.

12440521 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 320, while the sum is 19.

The square root of 12440521 is about 3527.1122749354. The cubic root of 12440521 is about 231.7107535324.

Adding to 12440521 its reverse (12504421), we get a palindrome (24944942).

The spelling of 12440521 in words is "twelve million, four hundred forty thousand, five hundred twenty-one".