13171421 has 4 divisors (see below), whose sum is σ = 13451712. Its totient is φ = 12891132.

The previous prime is 13171399. The next prime is 13171429. The reversal of 13171421 is 12417131.

It is a happy number.

13171421 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 12417131 = 1439 ⋅8629.

It is a cyclic number.

It is not a de Polignac number, because 13171421 - 2¹⁸ = 12909277 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 13171393 and 13171402.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13171429) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 140075 + ... + 140168.

It is an arithmetic number, because the mean of its divisors is an integer number (3362928).

Almost surely, 2^13171421 is an apocalyptic number.

It is an amenable number.

13171421 is a deficient number, since it is larger than the sum of its proper divisors (280291).

13171421 is an equidigital number, since it uses as much as digits as its factorization.

13171421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 280290.

The product of its digits is 168, while the sum is 20.

The square root of 13171421 is about 3629.2452383381. The cubic root of 13171421 is about 236.1624671290.

Adding to 13171421 its reverse (12417131), we get a palindrome (25588552).

The spelling of 13171421 in words is "thirteen million, one hundred seventy-one thousand, four hundred twenty-one".