13253440621 has 2 divisors, whose sum is σ = 13253440622. Its totient is φ = 13253440620.

The previous prime is 13253440579. The next prime is 13253440657. The reversal of 13253440621 is 12604435231.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 10570718596 + 2682722025 = 102814^2 + 51795^2 .

It is a cyclic number.

It is not a de Polignac number, because 13253440621 - 2¹¹ = 13253438573 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (13253440021) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6626720310 + 6626720311.

It is an arithmetic number, because the mean of its divisors is an integer number (6626720311).

Almost surely, 2^13253440621 is an apocalyptic number.

It is an amenable number.

13253440621 is a deficient number, since it is larger than the sum of its proper divisors (1).

13253440621 is an equidigital number, since it uses as much as digits as its factorization.

13253440621 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 17280, while the sum is 31.

Adding to 13253440621 its reverse (12604435231), we get a palindrome (25857875852).

The spelling of 13253440621 in words is "thirteen billion, two hundred fifty-three million, four hundred forty thousand, six hundred twenty-one".