16843421 has 8 divisors (see below), whose sum is σ = 19320384. Its totient is φ = 14384160.

The previous prime is 16843417. The next prime is 16843423. The reversal of 16843421 is 12434861.

16843421 = 91² + 92² + ... + 371².

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 16843421 - 2² = 16843417 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16843423) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2315 + ... + 6248.

It is an arithmetic number, because the mean of its divisors is an integer number (2415048).

Almost surely, 2^16843421 is an apocalyptic number.

It is an amenable number.

16843421 is a deficient number, since it is larger than the sum of its proper divisors (2476963).

16843421 is an equidigital number, since it uses as much as digits as its factorization.

16843421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8851.

The product of its digits is 4608, while the sum is 29.

The square root of 16843421 is about 4104.0737079151. The cubic root of 16843421 is about 256.3362940776.

The spelling of 16843421 in words is "sixteen million, eight hundred forty-three thousand, four hundred twenty-one".