16949221 has 4 divisors (see below), whose sum is σ = 17946252. Its totient is φ = 15952192.

The previous prime is 16949201. The next prime is 16949227. The reversal of 16949221 is 12294961.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 12348196 + 4601025 = 3514^2 + 2145^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-16949221 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16949227) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 498490 + ... + 498523.

It is an arithmetic number, because the mean of its divisors is an integer number (4486563).

Almost surely, 2^16949221 is an apocalyptic number.

It is an amenable number.

16949221 is a deficient number, since it is larger than the sum of its proper divisors (997031).

16949221 is an equidigital number, since it uses as much as digits as its factorization.

16949221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 997030.

The product of its digits is 7776, while the sum is 34.

The square root of 16949221 is about 4116.9431621046. The cubic root of 16949221 is about 256.8718898004.

The spelling of 16949221 in words is "sixteen million, nine hundred forty-nine thousand, two hundred twenty-one".