16643222 has 4 divisors (see below), whose sum is σ = 24964836. Its totient is φ = 8321610.

The previous prime is 16643213. The next prime is 16643227. The reversal of 16643222 is 22234661.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 22234661 = 223 ⋅99707.

It is a junction number, because it is equal to n+sod(n) for n = 16643191 and 16643200.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16643227) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4160804 + ... + 4160807.

It is an arithmetic number, because the mean of its divisors is an integer number (6241209).

Almost surely, 2^16643222 is an apocalyptic number.

16643222 is a deficient number, since it is larger than the sum of its proper divisors (8321614).

16643222 is an equidigital number, since it uses as much as digits as its factorization.

16643222 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8321613.

The product of its digits is 3456, while the sum is 26.

The square root of 16643222 is about 4079.6105206257. The cubic root of 16643222 is about 255.3166487987.

Adding to 16643222 its reverse (22234661), we get a palindrome (38877883).

The spelling of 16643222 in words is "sixteen million, six hundred forty-three thousand, two hundred twenty-two".