16702221 has 4 divisors (see below), whose sum is σ = 22269632. Its totient is φ = 11134812.

The previous prime is 16702219. The next prime is 16702237. The reversal of 16702221 is 12220761.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 16702221 - 2¹ = 16702219 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 (16702201) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2783701 + ... + 2783706.

It is an arithmetic number, because the mean of its divisors is an integer number (5567408).

Almost surely, 2^16702221 is an apocalyptic number.

It is an amenable number.

16702221 is a deficient number, since it is larger than the sum of its proper divisors (5567411).

16702221 is an equidigital number, since it uses as much as digits as its factorization.

16702221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5567410.

The product of its (nonzero) digits is 336, while the sum is 21.

The square root of 16702221 is about 4086.8350835335. The cubic root of 16702221 is about 255.6179859307.

Adding to 16702221 its reverse (12220761), we get a palindrome (28922982).

The spelling of 16702221 in words is "sixteen million, seven hundred two thousand, two hundred twenty-one".