16699221 has 24 divisors (see below), whose sum is σ = 30074304. Its totient is φ = 8674560.

The previous prime is 16699217. The next prime is 16699223. The reversal of 16699221 is 12299661.

It is not a de Polignac number, because 16699221 - 2² = 16699217 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16699223) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 11356 + ... + 12741.

It is an arithmetic number, because the mean of its divisors is an integer number (1253096).

Almost surely, 2^16699221 is an apocalyptic number.

16699221 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

16699221 is a deficient number, since it is larger than the sum of its proper divisors (13375083).

16699221 is a wasteful number, since it uses less digits than its factorization.

16699221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24121 (or 24118 counting only the distinct ones).

The product of its digits is 11664, while the sum is 36.

The square root of 16699221 is about 4086.4680348683. The cubic root of 16699221 is about 255.6026805835.

The spelling of 16699221 in words is "sixteen million, six hundred ninety-nine thousand, two hundred twenty-one".