13155421 has 2 divisors, whose sum is σ = 13155422. Its totient is φ = 13155420.

The previous prime is 13155397. The next prime is 13155427. The reversal of 13155421 is 12455131.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 9211225 + 3944196 = 3035^2 + 1986^2 .

It is a cyclic number.

It is not a de Polignac number, because 13155421 - 2¹⁵ = 13122653 is a prime.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 13155392 and 13155401.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (13155427) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6577710 + 6577711.

It is an arithmetic number, because the mean of its divisors is an integer number (6577711).

Almost surely, 2^13155421 is an apocalyptic number.

It is an amenable number.

13155421 is a deficient number, since it is larger than the sum of its proper divisors (1).

13155421 is an equidigital number, since it uses as much as digits as its factorization.

13155421 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 600, while the sum is 22.

The square root of 13155421 is about 3627.0402534298. The cubic root of 13155421 is about 236.0668021655.

The spelling of 13155421 in words is "thirteen million, one hundred fifty-five thousand, four hundred twenty-one".