13240621 has 2 divisors, whose sum is σ = 13240622. Its totient is φ = 13240620.

The previous prime is 13240613. The next prime is 13240651. The reversal of 13240621 is 12604231.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 8352100 + 4888521 = 2890^2 + 2211^2 .

It is an emirp because it is prime and its reverse (12604231) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 13240621 - 2³ = 13240613 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (13240651) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6620310 + 6620311.

It is an arithmetic number, because the mean of its divisors is an integer number (6620311).

Almost surely, 2^13240621 is an apocalyptic number.

It is an amenable number.

13240621 is a deficient number, since it is larger than the sum of its proper divisors (1).

13240621 is an equidigital number, since it uses as much as digits as its factorization.

13240621 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 288, while the sum is 19.

The square root of 13240621 is about 3638.7664118489. The cubic root of 13240621 is about 236.5753283280.

Adding to 13240621 its reverse (12604231), we get a palindrome (25844852).

It can be divided in two parts, 13240 and 621, that added together give a triangular number (13861 = T₁₆₆).

The spelling of 13240621 in words is "thirteen million, two hundred forty thousand, six hundred twenty-one".