16693221 has 8 divisors (see below), whose sum is σ = 22975744. Its totient is φ = 10769760.

The previous prime is 16693219. The next prime is 16693223. The reversal of 16693221 is 12239661.

It is an interprime number because it is at equal distance from previous prime (16693219) and next prime (16693223).

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

It is not a de Polignac number, because 16693221 - 2¹ = 16693219 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 (16693223) 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, 89656 + ... + 89841.

It is an arithmetic number, because the mean of its divisors is an integer number (2871968).

Almost surely, 2^16693221 is an apocalyptic number.

It is an amenable number.

16693221 is a deficient number, since it is larger than the sum of its proper divisors (6282523).

16693221 is a wasteful number, since it uses less digits than its factorization.

16693221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 179531.

The product of its digits is 3888, while the sum is 30.

The square root of 16693221 is about 4085.7338386146. The cubic root of 16693221 is about 255.5720643889.

The spelling of 16693221 in words is "sixteen million, six hundred ninety-three thousand, two hundred twenty-one".