17311421 has 4 divisors (see below), whose sum is σ = 17319744. Its totient is φ = 17303100.

The previous prime is 17311417. The next prime is 17311429. The reversal of 17311421 is 12411371.

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.

It is a cyclic number.

It is not a de Polignac number, because 17311421 - 2² = 17311417 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 17311393 and 17311402.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (17311429) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2006 + ... + 6216.

It is an arithmetic number, because the mean of its divisors is an integer number (4329936).

Almost surely, 2^17311421 is an apocalyptic number.

It is an amenable number.

17311421 is a deficient number, since it is larger than the sum of its proper divisors (8323).

17311421 is an equidigital number, since it uses as much as digits as its factorization.

17311421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8322.

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

The square root of 17311421 is about 4160.6995805994. The cubic root of 17311421 is about 258.6887681352.

Adding to 17311421 its reverse (12411371), we get a palindrome (29722792).

The spelling of 17311421 in words is "seventeen million, three hundred eleven thousand, four hundred twenty-one".