13336621 has 2 divisors, whose sum is σ = 13336622. Its totient is φ = 13336620.

The previous prime is 13336597. The next prime is 13336643. The reversal of 13336621 is 12663331.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 13060996 + 275625 = 3614^2 + 525^2 .

It is an emirp because it is prime and its reverse (12663331) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 13336621 - 2¹⁹ = 12812333 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (13336681) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6668310 + 6668311.

It is an arithmetic number, because the mean of its divisors is an integer number (6668311).

Almost surely, 2^13336621 is an apocalyptic number.

It is an amenable number.

13336621 is a deficient number, since it is larger than the sum of its proper divisors (1).

13336621 is an equidigital number, since it uses as much as digits as its factorization.

13336621 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1944, while the sum is 25.

The square root of 13336621 is about 3651.9338712523. The cubic root of 13336621 is about 237.1457084969.

Adding to 13336621 its reverse (12663331), we get a palindrome (25999952).

The spelling of 13336621 in words is "thirteen million, three hundred thirty-six thousand, six hundred twenty-one".