16221673 has 8 divisors (see below), whose sum is σ = 17549000. Its totient is φ = 14905728.

The previous prime is 16221661. The next prime is 16221677. The reversal of 16221673 is 37612261.

It can be written as a sum of positive squares in 4 ways, for example, as 831744 + 15389929 = 912^2 + 3923^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 16221673 - 2⁵ = 16221641 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (16221677) 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, 253 + ... + 5701.

It is an arithmetic number, because the mean of its divisors is an integer number (2193625).

Almost surely, 2^16221673 is an apocalyptic number.

16221673 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

It is an amenable number.

16221673 is a deficient number, since it is larger than the sum of its proper divisors (1327327).

16221673 is a wasteful number, since it uses less digits than its factorization.

16221673 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5691.

The product of its digits is 3024, while the sum is 28.

The square root of 16221673 is about 4027.6138096893. The cubic root of 16221673 is about 253.1425870623.

The spelling of 16221673 in words is "sixteen million, two hundred twenty-one thousand, six hundred seventy-three".