13717421 has 4 divisors (see below), whose sum is σ = 13724832. Its totient is φ = 13710012.

The previous prime is 13717391. The next prime is 13717423. The reversal of 13717421 is 12471731.

It is a happy number.

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 a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 12471731 = 317 ⋅39343.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-13717421 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13717423) 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, 1706 + ... + 5508.

It is an arithmetic number, because the mean of its divisors is an integer number (3431208).

Almost surely, 2^13717421 is an apocalyptic number.

It is an amenable number.

13717421 is a deficient number, since it is larger than the sum of its proper divisors (7411).

13717421 is an equidigital number, since it uses as much as digits as its factorization.

13717421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7410.

The product of its digits is 1176, while the sum is 26.

The square root of 13717421 is about 3703.7036868519. The cubic root of 13717421 is about 239.3816314996.

The spelling of 13717421 in words is "thirteen million, seven hundred seventeen thousand, four hundred twenty-one".