16743421 has 4 divisors (see below), whose sum is σ = 17099712. Its totient is φ = 16387132.

The previous prime is 16743413. The next prime is 16743443. The reversal of 16743421 is 12434761.

It is the 1671-st star 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.

It is a cyclic number.

It is not a de Polignac number, because 16743421 - 2³ = 16743413 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 16743421.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16743451) 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, 178075 + ... + 178168.

It is an arithmetic number, because the mean of its divisors is an integer number (4274928).

Almost surely, 2^16743421 is an apocalyptic number.

It is an amenable number.

16743421 is a deficient number, since it is larger than the sum of its proper divisors (356291).

16743421 is an equidigital number, since it uses as much as digits as its factorization.

16743421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 356290.

The product of its digits is 4032, while the sum is 28.

The square root of 16743421 is about 4091.8725542226. The cubic root of 16743421 is about 255.8279941968.

The spelling of 16743421 in words is "sixteen million, seven hundred forty-three thousand, four hundred twenty-one".