16730421 has 8 divisors (see below), whose sum is σ = 23026944. Its totient is φ = 10793760.

The previous prime is 16730387. The next prime is 16730423. The reversal of 16730421 is 12403761.

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

It is not a de Polignac number, because 16730421 - 2⁷ = 16730293 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 16730391 and 16730400.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16730423) 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, 89856 + ... + 90041.

It is an arithmetic number, because the mean of its divisors is an integer number (2878368).

Almost surely, 2^16730421 is an apocalyptic number.

It is an amenable number.

16730421 is a deficient number, since it is larger than the sum of its proper divisors (6296523).

16730421 is a wasteful number, since it uses less digits than its factorization.

16730421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 179931.

The product of its (nonzero) digits is 1008, while the sum is 24.

The square root of 16730421 is about 4090.2837309898. The cubic root of 16730421 is about 255.7617666911.

The spelling of 16730421 in words is "sixteen million, seven hundred thirty thousand, four hundred twenty-one".