13191421 has 2 divisors, whose sum is σ = 13191422. Its totient is φ = 13191420.

The previous prime is 13191419. The next prime is 13191449. The reversal of 13191421 is 12419131.

13191421 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 13039321 + 152100 = 3611^2 + 390^2 .

It is a cyclic number.

It is not a de Polignac number, because 13191421 - 2¹ = 13191419 is a prime.

Together with 13191419, it forms a pair of twin primes.

It is a junction number, because it is equal to n+sod(n) for n = 13191392 and 13191401.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (13191821) 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, 6595710 + 6595711.

It is an arithmetic number, because the mean of its divisors is an integer number (6595711).

Almost surely, 2^13191421 is an apocalyptic number.

It is an amenable number.

13191421 is a deficient number, since it is larger than the sum of its proper divisors (1).

13191421 is an equidigital number, since it uses as much as digits as its factorization.

13191421 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 216, while the sum is 22.

The square root of 13191421 is about 3631.9995870044. Note that the first 3 decimals coincide. The cubic root of 13191421 is about 236.2819394497.

The spelling of 13191421 in words is "thirteen million, one hundred ninety-one thousand, four hundred twenty-one".