16755221 has 8 divisors (see below), whose sum is σ = 19766784. Its totient is φ = 13898160.

The previous prime is 16755181. The next prime is 16755227. The reversal of 16755221 is 12255761.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-16755221 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 (16755227) 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, 38390 + ... + 38823.

It is an arithmetic number, because the mean of its divisors is an integer number (2470848).

Almost surely, 2^16755221 is an apocalyptic number.

It is an amenable number.

16755221 is a deficient number, since it is larger than the sum of its proper divisors (3011563).

16755221 is an equidigital number, since it uses as much as digits as its factorization.

16755221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 77251.

The product of its digits is 4200, while the sum is 29.

The square root of 16755221 is about 4093.3141829085. The cubic root of 16755221 is about 255.8880787208. Note that the first 3 decimals are identical.

The spelling of 16755221 in words is "sixteen million, seven hundred fifty-five thousand, two hundred twenty-one".